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HIIT Timer
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Double-Under Timer

Double-unders in six 30-second sets, 45 seconds of rest between them, with 90 seconds to warm up and 90 to wind down — 9:45 total. Rest outlasts work on purpose: doubles are a skill, and skills aren’t learned breathless.

Thirty seconds is enough for a respectable set without the wheels coming off, and the long break means you attack each one fresh. Trip mid-set? A few singles to find the bounce again, then back up. Still chasing your first doubles? Open it in the editor and lengthen the rests while the skill is raw.

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Frequently Asked Questions

How long are the Double-Under Intervals?
9:45 from the first warmup second to the end of the cooldown, with the six 30-second work sets spaced out by 45-second rests in the middle.
Why 45 seconds of rest after only 30 of work?
Double-unders fall apart fast once your timing goes. The 45-second break gives your calves and your rhythm time to recover, so every set is practice at the real movement rather than survival.
I trip constantly — should I still run this?
Yes. Treat each 30-second window as attempts, not unbroken reps: a trip, a couple of singles, and another attempt is exactly how the skill gets built.