Beth Skwarecki is Lifehacker’s Senior Health Editor, and holds certifications as a personal trainer and weightlifting coach. She has been writing about health for over 10 years. High intensity ...

How to use this list: Perform the exercises in the order listed below for 20 seconds each. Rest for 10 seconds in between each move. Do 3 to 4 rounds, resting for 30 to 60 seconds in between each ...

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Directions: Warm up for a few minutes with dynamic stretches and some light cardio such as jump roping or lateral shuffles. The workout is broken up into three circuits, all of which have three ...

High-intensity interval training (HIIT) is as popular as ever. Join the trend with these tips on what to wear, how to warm up, and more. No doubt you’ve heard the buzz about high-intensity interval ...

An icon in the shape of a lightning bolt. Impact Link Dear Rachel, After years of doing cardio and HIIT classes, I'm trying to incorporate more strength training into my fitness regime as I want to ...

Dancer and choreographer Kaleila Jordan will have you sweating in this quick and festive 10-minute dance session, combining holiday-themed hip-hop moves with high-intensity interval training.