AI Endurance Coach

Your watch records.
Coach understands.
You get faster.

An AI coach that actually reads your training data. Builds your plan. Adapts as you go. The first endurance coach that lives in your pocket.

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Live coaching 13.94 km · long run · Saturday
Avg HR
136bpm
↓ Z2 zone held
Drift
+4.2%
strong aerobic
Time in Z2
78%
on target
Pace
5:21/km
conversational
C
Coach — Solid execution. You held under your Z2 ceiling (157 bpm) the entire run, and 4.2% drift confirms a strong aerobic engine. Tomorrow's recovery day will let you absorb this work. Keep building base.
How it works

Three steps to a smarter training week

From signup to a coached week in minutes. No human coach, no spreadsheets, no guessing.

i

Tell Coach about you

Quick intake. Your goal, your time, your level. Coach uses this to design a plan calibrated to your life, not a generic template.

A
Alex M.
Intermediate runner
GoalSub-40 10K
Time5 h / week
LTHR171 bpm
ii

Get your plan

Periodized training built on proven endurance frameworks, your LTHR zones, and 80/20 distribution. Loaded into a calendar you can actually use.

12Easy
13VO2
14Rest
15Tempo
16Easy
17Rest
18Long
iii

Train, upload, adapt

Upload after each session. Coach reads your data, comments on the run, and adjusts the plan when patterns emerge. You just train.

Inside the app

Your coach, in your pocket

Chat, calendar, and every workout in one clean place. Built to feel like it belongs on your phone.

This week
MEasy TVO2 WRest TTempo FEasy SRest SLong
4 sessions · 32 km · 5h 10m
Tempo 8 km via Strava
41mTime
162Avg HR
74Load
9:41
Stryxs
Done
Today is 5 × 1 km @ threshold. Hold 168–172 bpm on the reps and float the recoveries.
Threshold 5×1km Threshold
52 min8.4 kmZ4
A
Felt strong, legs a touch heavy though.
Done
Noted. 4.1% drift is excellent. Tomorrow stays easy so you absorb it.
Coach insight
Your aerobic base is trending up. Cardiac drift is down 1.8% over the last three weeks at the same pace.
171bpm
Lactate threshold HR
cardiac drift
LTHR zones
80/20 polarized
acute:chronic load
aerobic base
tempo
threshold
VO2 max
cardiac drift
LTHR zones
80/20 polarized
acute:chronic load
aerobic base
tempo
threshold
VO2 max
The gap

What others do. What we do.

Tools today record data. They don't coach you. Stryxs closes that gap.

⌚
Garmin
Records
Captures everything. Tells you nothing about what to change.
🧡
Strava
Cheers
"Nice run!" is not a training adjustment.
📊
TrainingPeaks
Displays
Numbers without meaning, unless you pay $300/mo for a coach.
⚡
Stryxs
Coaches
Reads your data, decides what's next, tells you why. From $14.99/mo.

Stop guessing.
Start training.

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