Endure Running

Endure is a personal running coach that lives entirely on your iPhone — with no subscriptions, no new accounts, and no syncing to third-party platforms.

It reads your workouts, heart rate, HRV, and sleep data directly from Apple Health, then highlights the coaching signals that truly matter: your recovery status, the type of run to do today, and whether your training is progressing correctly.

— READINESS & TRAINING LOAD —
Each day, Endure evaluates your readiness across four levels — Ready, Normal, Caution, Recover — using your HRV trend, resting heart rate, sleep, and recent training load. The Training tab displays your fitness (CTL), fatigue (ATL), and form (TSB): the same metrics used by elite endurance coaches, presented in a way that’s designed for regular runners, not data scientists.

— DAILY TRAINING SUGGESTION —
Endure's suggestion engine analyzes your recent workout pattern, weekly schedule, and current fitness trend to recommend exactly what you should do today: Rest, Easy, Steady, Tempo, or Long. It also explains its reasoning so you understand why, not just what.

— RACE PREDICTOR & TRAINING PACES —
Set a race goal with a target distance and finish time. Endure uses your actual PR data with the Riegel formula and VDOT system to predict your finish times across different distances and creates a personalized set of training paces: Easy, Steady, Tempo, Threshold, Interval, and Repetition.

— TRENDS THAT MEAN SOMETHING —
Three charts illustrate your season’s progress: an 8-week volume chart to monitor your load, a 12-month consistency chart to assess your routine, and a 12-week pace trend to confirm improvements. Each chart includes a simple, plain-English summary.

— YOUR RUNS, FULLY ANALYZED —
Every run displays pace zones, per-mile splits, HR timeline, elevation profile, and a route map with an optional heart rate zone overlay. You can also share a branded run card — with your route — directly from the run detail screen.

— APPLE WATCH & HOME SCREEN WIDGET —
Your weekly mileage ring and current streak are visible on your home screen and Apple Watch, updating automatically after each run.

— YOUR DATA STAYS YOURS —
Endure works with every run you've ever recorded on Apple Watch, iPhone, or any HealthKit-compatible device. Nothing is uploaded to any server. Ever.