I'm a Fitness Model, and These Are the 7 Exercises I Do to Stay Lean

Sprinting workouts are truly infinite. You can do longer sprints like 400 meters (one lap around a running track) or shorter sprints like 100 meters. You can do intervals on the treadmill, up a hill, or down your street. Sprinting is one of the quickest ways to blast fat and build muscle, but you'll also improve your overall strength and power, especially in your legs.