AI coach

The NexRex AI assistant (Rex) answers training questions, reviews your activities, and can draft or adjust workouts directly in conversation. Rex learns your goals, injury history, and preferences over time to provide personalized guidance.

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Ask anything

Open the Rex chat from your home screen or the chat tab to ask about pacing, recovery, race strategy, or why a specific workout is on your calendar. Rex responds with answers grounded in your recent activities, current plan, and training history.

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Post-run insights

After an activity syncs, NexRex generates a short read on how it went — effort, pacing, and what it means for upcoming sessions.

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Workout drafts in chat

When you ask Rex to build or adjust a workout in chat, the reply now appears as a structured workout-draft card directly inside the conversation instead of plain text. The card gives you a scannable preview of what Rex came up with before anything is saved to your plan. Each card shows:

• A title and short subtitle summarising the session.
• A status pill — for example Draft, Review, Ready, or Error — so you can tell at a glance whether Rex still needs input.
• Nested workout blocks with steps, durations, distances, and rounds for any repeats.
• Session totals, so you can see overall duration and volume without expanding every block.

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Clarifying an ambiguous request

If Rex isn’t sure how to interpret part of your request — for example whether “4 × 1k” should be at threshold or interval pace — the card surfaces an ambiguity panel with tappable choice chips. Pick the option that matches what you had in mind and Rex updates the draft in place.

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Fast and Pro models

Rex offers two response models you can switch between from the app bar in the Rex chat tab: Fast and Pro. Fast is optimized for quick replies; Pro uses a more capable model for deeper reasoning on complex questions — planning tweaks, race strategy, or interpreting several weeks of training at once.

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Choose a model

1. Open the Rex tab in chat (the model selector doesn’t appear on the direct-message conversation with your human coach).
2. Tap the model name in the app bar — Fast or Pro.
3. Pick the option you want. Your choice is remembered across sessions and applies to every message you send until you change it again.

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Who gets Pro

Pro is a Pro-subscription feature and is also available to coaches on any active plan.

• Coaches and Pro subscribers default to Pro and can switch to Fast at any time.
• Everyone else defaults to Fast. The Pro option is visible but locked with a PRO badge — tapping it opens the standard subscription paywall instead of switching the model.

If your Pro entitlement lapses, Rex automatically falls back to Fast on your next message, even if Pro was your last saved choice. Re-subscribe and Pro becomes selectable again.

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Choose which AI insights & reminders you receive

You control which AI-generated summaries and reminders NexRex sends you from Settings → Training Settings. These are delivery preferences that act on your training data, so they live alongside your other training controls.

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Open the controls

1. Open the NexRex app.
2. Go to Settings.
3. Tap Training Settings.
4. Scroll to the AI insights & reminders section.

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What each toggle controls

The AI insights & reminders switch at the top of the section turns all four features on or off in one tap. Below it, each feature has its own toggle:

• Activity summary — an insight after each completed activity.
• Weekly summary — your training recap every Monday.
• Daily reminder — today’s plan and recovery prompt.
• AI monthly report — a deeper AI-generated month-in-review.

Toggles save as soon as you flip them, and NexRex stops generating and delivering that feature on the next cycle. Turning AI monthly report off also deletes your existing personal monthly reports immediately — turning it back on generates future reports but does not restore the deleted ones. If a weekly summary is being generated at the exact moment you opt out, NexRex retires the summary instead of delivering it, even if you re-enable the toggle before generation completes. If a change can’t reach the server you’ll see Could not update AI preferences. Please try again. and the toggle reverts.

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Monthly running recap email

On the 1st of each month, NexRex emails you a recap of the previous month’s running. The recap sends automatically. You don’t need to request it or turn anything on.

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When it arrives

• The email is delivered on the morning of the 1st, between 08:00 and 10:00 in your own time zone.
• You receive at most one recap per month, even if delivery is retried.
• You only get a recap for months where you logged at least three runs. Quieter months are skipped.

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What’s inside

• Month totals — distance, number of runs, and active days.
• Comparison with the previous month — shown only once you have a prior month of data. Your first recap shows the current month on its own.
• Key run — your longest run of the month. Walks and hikes don’t count, so the pick always matches the runs in your totals.
• Body signals — recovery, resting heart rate, and sleep, when your connected device provides them.
• Race countdown — if you have an upcoming key race set.
• Training plan progress — your current week and focus, shown only while the plan is still active. Ended plans don’t appear.
• Your coach’s read on the month — two short AI-written paragraphs summarising the month and looking ahead to the next one.

The email is written in your app language (English, Traditional Chinese, or Japanese).

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Stop receiving the recap

Use the unsubscribe link in the email footer to stop future recaps. The link works with one click and doesn’t require signing in. Each recap also ends with quick feedback links so you can tell NexRex whether the email was useful.

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Choose your AI coach

The AI Coach setting is where you pick which AI coach answers you in chat and represents you across the app. Your selection now drives every AI coach surface — chat, the home screen badge, weekly summaries, daily updates, and notifications all use the same name, avatar, and brand colour as the coach you picked.

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Open the picker

1. Open the NexRex app.
2. Go to Settings.
3. Tap AI 教練 (AI Coach).

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What you’ll see

The screen is a single flat list of the AI coaches that can serve you. From top to bottom:

1. Follow the organization default — a first-row option if your organization has designated a default coach. Picking it means “when your coach changes the default, you change with it.” A Currently <name> label shows which coach is serving you right now.
2. Coach-authored AI coaches — any AI coaches your coach has published to your organization. Each row shows the display name, a short summary, and a Created by <author> line.
3. NexRex AI coaches — the platform coaches under an AI COACHES header:
   • Rex — data-first, talks to you in numbers.
   • Joy — company-first, checks how you are before the session.
   • Max — appears as a Coming soon preview. The row is non-interactive and can’t be selected until it is enabled for your account.

The marked row is the coach that will answer your next message. If the list can’t load, you’ll see AI coaches are unavailable right now. Please try again later. instead of an empty screen.

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Switch coaches

1. Tap the coach you want to use.
2. Wait for the confirmation snackbar (AI Coach updated to <name>).

The mark moves with your tap and the app reconciles it against the saved selection. If the save fails, your previous coach stays active and you’ll see an error snackbar. Once the save completes, the new coach’s name, avatar, and colour appear everywhere in the app — chat header, home badge, weekly summary, daily update, and any AI-generated notifications.

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Follow the organization default

Picking Follow the organization default clears your personal choice. The app then serves you whichever coach your organization has set as its default, and the row shows *Currently *<name>*** so you always know who that is. Use this if you want to follow whatever your coach rolls out next without re-picking each time.

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When a coach is retired

If the coach you previously picked is revoked by your organization or is otherwise unavailable, the app doesn’t leave you with a broken selection. The Follow the organization default row shows Your earlier choice “<name>” was retired by your coach., your selection automatically falls back to the resolved default, and every surface updates to the new coach’s identity on your next message.

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Onboarding

New accounts pick an AI coach as part of onboarding. The choice is saved alongside the rest of your setup, so the app opens with your coach already in place — no extra visit to Settings is required.

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AI insight and reminder settings moved

Controls for activity summaries, the weekly summary, daily reminders, and the AI monthly report used to live at the bottom of this screen. They’ve moved to their own screen under Training Settings so the AI Coach screen only answers “who is my coach”. Those toggles are documented in Choose which AI insights & reminders you receive above.

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Chat with a coach-authored AI coach

Picking a coach-authored AI coach doesn’t limit what you can do in chat. A published coach keeps the persona and knowledge your coach gave it, and it works with your data and takes training actions the same way Rex does.

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Answers grounded in your data

A coach-authored coach answers with your own data: recent activities, your training plan, upcoming workouts, recovery, and race context. Ask “how did my last long run go?” and you get an answer about your run, not generic advice.

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Training actions in chat

A coach-authored coach can take the same training actions as Rex, directly from the conversation:

• Draft, refine, and save workouts and training plans.
• Adjust a workout that’s already on your plan.
• Propose and apply changes to your training week.
• Record workout reviews and status updates such as an injury or time away.

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Your conversation and memory carry over

Switching coaches keeps your ongoing conversation and everything in Rex’s Memory (see below). A coach-authored coach reads and builds on the same memory, so you never start over after a switch.

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Result cards

Workouts and plans a coach-authored coach creates appear as the same structured cards described in Workout drafts in chat above. Each card shows whether the result is still a draft or has been saved or applied to your plan, so you always know what actually changed. Reply in the conversation to refine a result and the card updates in place.

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Retry a response

If a reply fails partway, for example after a dropped connection, the failed message shows a Retry response action. Retrying resends your original request instead of creating a new one. If the coach already completed a training action, NexRex returns the finished result rather than running the action again, so a retry never saves a duplicate workout or plan.

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Rate an AI summary

Activity summaries and weekly summaries each end with Was this summary helpful? and a thumbs-up / thumbs-down pair. The prompt appears on the activity summary bottom sheet and on the full-screen weekly summary. Your rating helps NexRex tune future summaries.

• Tap thumbs up to send positive feedback. You’ll see Thanks, feedback saved and no further prompts.
• Tap thumbs down to open the What could be better? sheet.

In the negative-feedback sheet you can:

1. Tick any reasons that apply — Not accurate, Not useful, Too generic, or Tone felt wrong.
2. Add an optional comment describing what felt off.
3. Optionally turn on Turn off AI summaries to stop both activity and weekly summaries.
4. Tap Send feedback.

If Turn off AI summaries is checked when you send, NexRex disables the activity summary and weekly summary features for you immediately — the same result as flipping both toggles off in Settings → Training Settings. New summaries stop being generated right away. Turn them back on any time from that screen. If feedback can’t be saved you’ll see Could not save feedback. Please try again. and the reaction isn’t recorded.

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Weekly check-in

After your weekly summary, Rex runs a short check-in in chat — a few questions about how the week felt, so next week’s coaching reflects more than just your activity data.

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Answering questions

Each question arrives with tappable answer chips. Tap the chip that matches and the check-in moves on. Depending on the question you can also:

• 💬 Chat more — answer in your own words instead of picking a chip.
• Skip for now — leave the check-in; you can come back to it later.

If a question needs a structured rating and you answered in free text, Rex keeps the chips on screen and asks you to also pick the closest option — that rating is what tunes your plan.

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Choosing what your coach sees

Every answer is private by default. Before an answer is saved, Rex asks whether your coach may see it, and you choose per answer:

• Yes, share with my coach — your coach can read this answer alongside your weekly summary, and it can inform the plan-adjustment proposals your coach reviews.
• No, keep it between us — the answer stays between you and your AI coach. Your coach sees only a count of answers you kept private, never the content.

The choice is separate for each answer, so you can share some answers and keep others private within the same check-in. Whatever you pick, your AI coach still uses every answer for you — follow-ups in next week’s summary, Rex’s Memory, and your own plan adjustments all work the same either way.

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Planning next week

When the check-in wraps up, Rex offers to put together next week’s plan only if you don’t already have one. If an active personal or group plan covers you, the offer doesn’t appear.

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Rex’s Memory

Rex’s Memory is the editable store of durable facts your AI coach remembers about you — goals, injuries, preferences, lifestyle constraints, and similar context that should outlast a single chat. Editing this list changes how Rex coaches you going forward.

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Open Rex’s Memory

1. Open the NexRex app.
2. Go to Settings.
3. Tap Rex’s Memory.

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What you’ll see

Memories are grouped by category — for example Goals, Injury, Preferences, Lifestyle, Communication, Equipment, Race context, and Notes. Each row shows:

• The memory text.
• A provenance badge indicating who added it:
  • You — you added it yourself.
  • Coach — your coach added it.
  • Rex — Rex picked it up from your chats.
• A last-updated label so you can tell how fresh each entry is.

If Rex hasn’t learned anything durable yet, you’ll see an empty state inviting you to keep chatting or add a memory yourself.

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Add a memory

1. On the Rex’s Memory screen, tap Add memory.
2. In the bottom-sheet form, pick a Category and type the Memory text (for example, Prefers morning runs before work).
3. Tap Save.

The new entry appears under its category with a You badge.

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Edit a memory

1. Tap the memory you want to change.
2. Update the category or text in the bottom-sheet form.
3. Tap Save.

The row’s last-updated label refreshes to reflect your change.

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Delete a memory

1. Swipe the memory row from right to left.
2. Confirm Forget in the dialog that appears.

Choosing Cancel keeps the memory and slides the row back into place. Once forgotten, Rex no longer uses that fact when coaching you, but you can always add it back later.