Standing is one of the more challenging positions because often the receiving partner has to allow the partner to lift them in some way, says Britton.
If the partners are facing each other in this workout sex position, core, and upper-leg strength comes into play: If the receiving partner is standing on one leg, those are worked to stay upright, and core muscles are engaged to keep balanced.
Rather than having your hands flat on the bed, "if the receiving partner has their hands on a wall in front of them and sort of uses their upper body to help thrust, that would be a good shoulder and upper body workout," says Berman.
With your legs intercrossed with your partner's, there's limited movement for both people, so a lot of inner-thigh strength and core stabilization will be at work, making this a great sex position for fitness.
Worst-case scenario, you could throw out your back or sustain some other injury — not exactly a bedroom turn-on.
Your core muscles, glutes, and thighs are all worked in the arch.