We have been using the Activator Belt for 1 year, and it’s a game-changer for sprint training. The resistance bands really help dial in frontside mechanics, making leg drive and ground contact feel more explosive. It took some time to get the hang of it, but the drills are straightforward, and I’ve noticed better form and power sprinting. Worth the $ for sprinters looking to level up. We were so impressed with the results, We just ordered a second one for my daughter.