Great workout while walking, running, hiking, advanced sports and plyometric training, improve balance and form, and the perfect tool for shadow boxing and high intensity sports movements. Develop greater speed, balance, power, and +performance with the Egg Weights Adult 1 lb. Running Pods set. Scientifically proven to increase the intensity of any workout from 28% to 62%! Burn an extra 2-4 calories per minute with any cardio activity.