You've likely seen and maybe even tried the ab workout where you sit back-to-back and pass a medicine ball back and forth. While Workout Digest does suggest this as a great partner workout, there's a way to take it up a notch.

Greatist recommends doing rotational squats with a partner as well. You're still back-to-back with your partner, but this time, you're squatting instead of sitting on the ground. Basically, it's like a wall-sit mixed with an ab workout. Talk about efficiency! Just make sure that you and your partner aren't actually touching backs, as you'll need some room to move.

Whether you're looking to try a new workout or it's your first time with a gym buddy, these moves will instantly make you look like a pro. If nothing else, you'll have a whole lot of fun with your friend at the gym.