Sprinting is the foundation of High Intensity Interval Training (HIIT), and will make your legs big, strong, fast, and powerful. Sprints are great for developing endurance, but also for developing lean muscle mass and speed strength. Ever seen a skinny sprinter? I didn’t think so.
Sure, squats are the almighty kings of the Gym Exercise Kingdom; but sprints are like the kings of the Functional Exercise Kingdom whose jacked-up, super-lean army of massive wheels is constantly trying to overthrow the squat as the #1 top leg exercise.