This story originally appeared in Well+Good.

At-home workouts are more popular than ever before. Whether you’re streaming a class from a boutique studio or sweating along with your favorite trainer during a live video workout, the options are truly endless. No question you can work up a sweat at home as you would at the gym, but there are some hard exercises to avoid until your next in-person training session in order to sidestep serious injury.

Maillard Howell, co-owner of Dean CrossFit and founder of The Beta Way, can easily name more than a few hard exercises you should avoid trying at home for the first time—and what you can do instead to get similar benefits.