Interval training for runners.
Build speed, strength, and stamina with structured workouts designed for real runners. No complexity, just results.
Download on the App Store
Start your day with a fresh workout recommendation tailored to your goals. Choose from Speed, Strength, Stamina, Endurance, or Fun, and we'll guide you to the perfect session.
From quick 20-minute intervals to long tempo runs, explore workouts across Intervals, Fartlek, Hills, Tempo, and Long Runs. Each workout shows effort levels, estimated time, and distance so you know exactly what you're getting into.
Large, glove-friendly controls and clear effort indicators keep you focused on your run. GPS-based distance tracking, haptic feedback at lap transitions, and a preview of what's coming next—all the guidance you need, nothing you don't.
Color-coded effort levels help you pace each interval correctly. From easy recovery (green) to max effort (purple), you'll always know how hard to push—and when to back off.
Designed for runners who want structure without the bloat.
Tap to start. No complex setup, no endless menus. Just you and the road.
Filter workouts by your current goal—Speed, Strength, Stamina, Endurance, or Fun.
Get notified at the start, end, and halfway point of each rep—even with your screen off.
Automatically save your workouts to Apple Health for a complete fitness record.
Bookmark your go-to workouts for instant access when you need them.
Accurate distance measurement with smart smoothing to avoid drift during rest periods.