Wake up.
Your coach already texted.

Both, honestly divided. The coaching decisions are made by a deterministic rules engine: seventeen hard-coded guardrail rules that read your recovery data and decide the direction of every day. Those rules were shaped with champion coaches, elite triathletes, and registered dietitians before they became code, and that engine is code a human wrote and tested, not a model guessing.

The AI's only job is language. It turns the engine's decision into a message that sounds like a coach instead of a spreadsheet. It cannot change your plan's direction, add volume, soften a stop, or turn a rest day into a workout.

The safety-critical words are neither. When anything looks like pain or a medical red flag, the AI is removed from the loop entirely and a fixed clinical template sends instead. So the judgment is engineered, the voice is generated, and the safety-critical words are written in advance and never vary.

It tells you the truth and respects your call. On a red-recovery day when you want to train anyway, Taper states the data plainly, recommends the adjustment, and gives you a drop-down plan if the session falls apart mid-way. It never shames an override and never pretends the data said something it did not.

The exceptions are pain and illness. Those are not overridable, because that boundary is what makes the rest of the autonomy safe.

Whoop is required to use Taper today: the entire coaching loop runs on Whoop's overnight recovery, HRV, sleep, and strain scoring. Garmin and Apple Watch are next on the roadmap, with Oura behind them.

Plainly: no Whoop, no Taper yet. If you're waiting on another wearable, leave your email below and you'll hear from us the day it ships.

Taper is built on endurance first: 70.3, marathon, cycling, open water. That is where the engine's teachers earned their records and where it coaches today.

The loop itself is sport-agnostic. Recovery in, decision out. Team-sport athletes are on the roadmap. If you have a race date and a wearable, you are who this was built for right now.

Broad, practical, and proven: race-week carb loading patterns, hourly fueling frameworks for long sessions, hydration reminders.

Not personalized macro calculations, deliberately. Those require a registered dietitian working with you directly, and Taper says so instead of guessing. It is the same boundary philosophy as the medical hard-stop: the coach knows exactly where its authority ends.

Any time, by text, with no retention flow and no phone call. Reply STOP and messages end immediately.

Your data, too. Ask for your data to be deleted and it is permanently removed within 7 days, wearable data and message history included; safety-related records are retained for up to two years as our privacy policy describes, then anonymized. Race Block is a one-time purchase and never renews by design.

Yes. Taper is live and coaching paying athletes daily. Signup is open and immediate: submit your number below and your setup link arrives by text within a minute. The founding rate stands while founding slots remain.