When walking and running in regular shoes, 30% of the weight is supported by our calves as our heels tend to take on the rest of the load. While using the Jump99 shoes, 100% of the weight in our body is supported by our calves. With Jump99 training shoes, the heel factor gets taken away. It feels like the user is always on his/her “tip toes” as the shoes forces them to rely heavily on the calf muscles. This shoe is not only made for people who look to become better at jumping, but actually can improve many aspects of an athlete. The Jump 99 training shoes mainly work to increase fast twitch muscle fibers (for explosive power), increase calve mass and definition,increase reactive strength and ability, improve sprint speed, and increase vertical jump. These several aspects can help people improve their athleticism and abilities for practically every sport.