Okay, so you’ve gotten a few weeks of strength training under your belt and you’ve documented your one-rep-max for those big barbell lifts. To progress toward the next PR, you’ll typically lift a ...

Beth Skwarecki is Lifehacker’s Senior Health Editor and has been writing about health, fitness, and science here since 2015. Beth was the recipient of the 2017 Carnegie Science Award in science ...

iFIT has a wealth of talented trainers at its disposal but none have quite the style and charisma of Knox Robinson. The New York native has chalked up nearly 100 videos on the platform, with series ...

If you’ve ever thought to yourself during a workout, wow this is super challenging, a 10 out of 10 for sure, you’ve actually been using RPE (rate of perceived exertion) to measure your exercise ...

Since there is no one-size-fits-all approach to exercise, it helps to have a personalized rating system that allows you to keep track of your own workout. After all, a casual jog for one person might ...

Fitness intensity can be one of the most subjective areas of working out. From “rate of perceived exertion” (or RPE) to the famous “runner’s high” or getting “in the zone,” these metrics can, at best, ...

Open right knee, rotating through the right hip to lift knee toward ceiling. Glutes should engage.

You're at the gym for a weightlifting session. But something feels off. You're not a beginner and want to get your workout in for the day, but your body isn't responding positively to the movement. Or ...