Illustration: David Wyffels
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Wall Sits
What it works: Quads and glutes
Leads to better sex because: You'll have more power in standing positions and more control over your hips in any position.
How to do it: Stand with your back against a wall, feet about shoulder width apart a foot or so in front of you. Slide your back down the wall, walking your feet out farther if necessary. The goal is to get your knees to a 90-degree angle while keeping them directly over your ankles. Hold that position until you feel a burn in your thighs, then adjust your feet so they're slightly farther apart. Hold again until you feel a burn, then take your feet a little wider one more time, and hold. If you need more of a challenge, Stanley recommends doing one-legged wall sits, where you lift one foot off the ground once you're in position, hold, then switch legs.
