A strong lower body is crucial to performance—whether you're looking to improve your sports performance, gym work, or just daily fuctional fitness. And yes, we said strong lower body.. Leg exercises aren't just for quads and hamstrings—these exercises will work your core muscles, improve your balance, and grant you the added benefits of things like grip strength. For the sake of your physique and training results, here are 30 strength-building lower body exercises to ensure you never skip leg day.