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40/10 Interval Timer

Forty seconds of work, ten of rest, eight rounds deep — a 4:1 ratio where the recovery barely exists. It’s a breath and a reset, not a real break, which makes 40/10 one of the more demanding shapes on the hub and a favorite for conditioning circuits that want the heart rate high and kept there.

Choose a movement and an effort you can genuinely repeat eight times, because the tiny rest punishes a fast start: fade in the first few rounds and the back half falls apart. It’s built for steady, sustainable conditioning — rowing, bike, swings, step-ups. Press start to run all eight rounds, or open the preset in the editor to add a warmup or stretch the rest while you adapt.

Good to Know

Frequently Asked Questions

How hard is 40/10 compared with 40/20?
Considerably harder. Halving the rest to 10 seconds turns a manageable 2:1 session into a near-continuous 4:1 effort, so pace each round well below all-out — the workout is about lasting, not peaking.
What is a 40/10 interval good for?
Building work capacity and mental durability. The short rest keeps your heart rate high throughout, which makes it a strong conditioning stimulus on a bike, rower, or with bodyweight and kettlebell movements.
Can I make the rest longer?
Yes — open the preset in the editor and lengthen the rest. Many people start at 40/20 and shorten the recovery toward 40/10 as their conditioning improves.