Question 1

What does Rex actually do every day?

Accepted Answer

Rex analyzes your sleep, HRV, recovery, and recent training data every morning, then delivers a coaching brief: what to run today, at what pace, and why. If your body isn’t ready, Rex modifies the workout or pulls intensity entirely.

Question 2

How is Rex different from a training plan?

Accepted Answer

A training plan doesn’t know you slept four hours. It doesn’t know your HRV has been declining for a week. Rex watches all of this and adjusts in real time. A plan is a guess about the future. Rex reacts to what actually happened.

Question 3

Does Rex use HRV to adjust my training?

Accepted Answer

Every morning. Rex tracks your HRV trend against your personal baseline, not a population average. If your HRV is suppressed for two days, Rex won’t just flag it. It will pull intensity, shift your hard sessions later in the week, and protect your key workouts. When your HRV rebounds, Rex ramps back up. The adjustments are automatic and specific to how your body is actually responding.

Question 4

Will Rex pull my workout if I’m not recovered?

Accepted Answer

Yes. If your HRV is suppressed, your sleep was short, or your training load is spiking, Rex will swap a hard session for an easy one and reschedule intensity for later in the week. Most apps only show the good days. Rex earns trust by protecting you on the bad ones.

Question 5

Is Rex actually personalized, or is it a template?

Accepted Answer

Every brief Rex writes is built from your data. Your HRV baseline, your training history, your race goals, your response to hard weeks. Two runners training for the same marathon will get completely different coaching because their bodies are different. Rex doesn’t use templates.

Question 6

Can Rex train me for a specific race?

Accepted Answer

Yes. Tell Rex your race and your goal time, and it builds a periodized plan: base phase, build phase, taper, race week. But unlike a static plan, Rex adjusts every phase based on how your body is actually responding. If you’re ahead of schedule, Rex pushes the pace. If you’re carrying fatigue, Rex protects your long runs and delays intensity. Two runners targeting the same marathon will train completely differently.

Question 7

How does Rex know what pace to prescribe?

Accepted Answer

Rex calculates training paces from your actual data: recent race results, workout splits, cardiac drift patterns, and how your pace responds at different effort levels. As your fitness changes, Rex recalibrates. You’ll never run stale paces from a calculator you used three months ago.

Question 8

What devices does Rex work with?

Accepted Answer

Strava, Garmin, and COROS. Connect your account and Rex reads your full training history, recovery patterns, and pacing trends. The more data Rex has, the sharper the coaching gets.

Question 9

Do I need a running coach if I use Rex?

Accepted Answer

Most runners don’t hire a coach. Not because coaching doesn’t work, but because it’s expensive and hard to find a good one. Rex gives you what a good coach does: daily decisions based on your data, adjusted for how your body is responding right now. If you already have a coach you trust, Rex isn’t trying to replace them. But if the alternative is guessing on your own, Rex is a significant upgrade.

Question 10

How long does setup take?

Accepted Answer

About 30 seconds. Connect your watch, set your goal, and Rex delivers your first coaching brief the next morning. No manual data entry, no questionnaire. Rex learns you from the data you already have.

Question 11

How much does Rex cost?

Accepted Answer

$25/month or $200/year. Every subscription starts with a 14-day free trial. Full experience from day one: daily briefs, adaptive adjustments, recovery modifications, pace recalibration. No feature gates. Cancel anytime.

Question 12

Can I try Rex before paying?

Accepted Answer

Two ways. Run a free training analysis right now: connect your watch and Rex shows you what it finds in your data. Or start a 14-day free trial with full daily coaching. If it doesn’t change how you train, cancel before the trial ends.

Question 13

What happens to my data?

Accepted Answer

Rex reads your training and recovery data to coach you. That’s it. Your data is encrypted, never sold, and never shared. You can delete your account at any time and your data goes with it. Rex is a coaching tool, not an advertising platform.

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