Want to mix up your cardio training and move to a different beat with each set? Agility ladders allow athletes to fine-tune their quickness and speed across a variety of drills, all while keeping their heart rate elevated for calorie-burning, sweat-inducing effectiveness. There’s a reason that many athletic teams use these simple training pieces as part of their conditioning regimens — the drills are intuitive, there’s little setup and working through the rungs is just plain fun.