What makes a great sprinter? Strong legs, explosive hips, and a solid upper body. This program is engineered to give you those key factors. Whether you run the 55m or the 400m this 4-week training program will build serious strength, explosiveness, and speed in the lower body and at the same time add size to the upper body. You will be able to push out of the blocks harder, maintain a more aggressive drive phase, and have the strength to finish your race strong.