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Two things that do the work instead of describing it
The guides explain how circuit training is put together. These do it. Both run in the browser, neither wants an account, and nothing you enter leaves your device.
Builder
6stations, ordered for you
Circuit builder
Give it your minutes, your level and what is in the room. It fills all six movement patterns and solves the rounds backwards from your time.
Build a sessionTimer
0:30work, then 15 rest
Interval timer
Runs 30/15, Tabata 20/10, 45/15 or anything you set, and names the station you are on and the one coming next.
Open the timerThey are meant to be used in that order: build once, then run the same session for three or four weeks. The builder has no reshuffle button on purpose, and the guide behind it explains why a circuit you rebuild every session can't tell you whether you're improving.