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Find out why this personal trainer can’t stop using these affordable three-pound dumbbells — and why they might be perfect ...

The workout, devised by The Body Coach app founder, Joe Wicks, is a 28-minute HIIT workout that uses a set of dumbbells.

Stonehouse notes. "You can modify by alternating arms, or switching it up with a hammer curl in a neutral grip." How to do it: Hold one dumbbell in each hand. Stand tall with your feet hip-width apart ...