Flex Interval Timer
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About this app
Flex Interval Timer is a highly flexible interval timer designed for any kind of training — weight training, HIIT, stretching, and more.
> Combine Phases Freely
Build your sessions with phases like Warm-Up, Work, Rest, and Cool-Down - in any order and duration you choose.
> Loop Settings
Group phases into loops to handle complex interval patterns with ease. Perfect for Tabata, circuit training, and more.
> Countdown to Stay Ready
A countdown before the start and before each phase ends keeps you prepared for what's coming next.
> Audio Cues for Timing
Sound effects notify you at every phase transition so you never lose track.
> Customize Phase Names
Rename phases in the menu to match your own training style.
> Track Your Training History
Review completed sessions in a calendar view to stay motivated and consistent.
> Save Presets for Quick Start
Save your favorite routines as presets and launch them in one tap next time.
> Dark / Light theme support
> Available in Japanese and English
> Combine Phases Freely
Build your sessions with phases like Warm-Up, Work, Rest, and Cool-Down - in any order and duration you choose.
> Loop Settings
Group phases into loops to handle complex interval patterns with ease. Perfect for Tabata, circuit training, and more.
> Countdown to Stay Ready
A countdown before the start and before each phase ends keeps you prepared for what's coming next.
> Audio Cues for Timing
Sound effects notify you at every phase transition so you never lose track.
> Customize Phase Names
Rename phases in the menu to match your own training style.
> Track Your Training History
Review completed sessions in a calendar view to stay motivated and consistent.
> Save Presets for Quick Start
Save your favorite routines as presets and launch them in one tap next time.
> Dark / Light theme support
> Available in Japanese and English
Build your own training rhythm with customizable phases and loops.
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