Interval Training
Choose work and rest durations and the number of rounds, then follow a clear countdown that can be paused and resumed.
Ready to start
00:30Round 1 of 6Total session: 03:50
Runs locally in your browser. This is a general timer, not medical or health advice.
A QUICK WALKTHROUGH
How to use this tool
- Set work seconds, rest seconds, and rounds.
- Start the timer and pause or resume whenever needed.
- Follow each phase until the final round completes.
Custom intervals
Set work and rest phases from 1 second to 30 minutes and choose 1 to 99 rounds.
Reliable pause and resume
The countdown uses browser timestamps, so pause freezes the exact remaining time and resume continues from it.
Local browser tool
Settings and timing stay in this browser. This is a general timer, not medical or health advice.
GOOD TO KNOW
Common questions
Can I pause during a phase?
Yes. Pause stops the timer and Resume continues from the same remaining time.
Is rest included after the last round?
No. Rest is placed only between rounds, so the total is work × rounds plus rest × (rounds − 1).
Does it upload my data?
No. The timer runs locally in your browser.