glute bridges

Illustration: David Wyffels

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Glute Bridge

What it works: Glutes and pelvic-floor muscles

Leads to better sex because: Your glutes power any thrusting motion, says Locker, plus you're strengthening your pelvic floor again.

How to do it: Lie on the floor with your hands by your side, feet on the floor and knees bent at a 45-degree angle. Squeeze your glutes to lift your butt and lower back off the floor and contract those pelvic-floor muscles at the same time. Lift until there's a straight line between your stomach and your knees, hold for 1 second, then return to start. You can add difficulty by holding dumbbells on top of your hips, or you can try a one-legged bridge, says Stanley, where one leg is pointed toward the ceiling, foot flexed, and you're driving your heel toward the sky as you lift your butt and back off the floor.