Alternating Side Lunge "This exercise is great for the hard to reach inner thigh and outside muscles of the leg," said Heidi Jones, a certified personal trainer at Performix House in New York City. It combines strength and mobility for a move that will work your muscles and get you sweating. Start with your feet directly under your hips. Step your right foot wide to the side, coming into a lunge with your left fingers touching your right foot. Your right knee shouldn't go beyond your right toes. Keep your chest lifted and your weight in your heels. Push into your right foot to return to standing, then lunge sideways to the left. This completes one rep. Image Source: POPSUGAR Photography