Build interval workouts that feel effortless.
Create custom timers, jump into premium interval routines, and keep everything synced with iCloud so your sessions follow you across devices.
Smart timer generator.
Describe the routine in natural language and get a precise, editable, saveable sequence of intervals.
Describe your routine
Jump Rope intense HIIT with short resting between exercises
Workout library
A growing set of interval routines.
Custom timers
Create sessions that match your training style.
Build from scratch with total control over rounds, rest time, and labels. Save templates for quick reuse.
Premium intervals
Included with ProStart premium workouts with one tap.
Choose from expertly designed interval sessions. Every workout includes clear titles, durations, and pacing hints.
Interval creator
Design every interval with a visual timeline.
Drag, reorder, and fine-tune each block with a clear timeline view so every session matches your pace.
How it works
Simple flow, powerful output.
Configure
Pick an interval structure or build one from scratch in seconds.
Personalize
Name each block, tune rest times, and save your favorites.
Train
Start the workout and stay focused with a clear full-screen timer.