Although cardio and strength-training may be more your style, flexibility can't be overlooked when it comes to sexual fitness. "Everybody as they age gets less and less flexible," says Schmit, "so you have to actively work on not only maintaining that but certainly improving that." The frogger is used to open the hips. To do this stretch, start on your hands and knees, then slowly slide your knees outward, to the side. Flex your feet and stop once you feel a stretch (but not pain). Walk your hands out and get on your elbows. Use your hands to press your hips back. Keep your shoulders relaxed and your head lifted. Recover from this stretch with Child's Pose. Schmit advises holding all stretches for a minimum of 20 seconds and a maximum of about 30 seconds.