The Hammer Strength Tibia Dorsi Flexion works the tibialis anterior at the front of the lower leg. Hammer Strength is the No. 1 brand of plate-loaded equipment in the world. It's tough enough to take what the best athletes in the world dole out, and rugged enough for the home gym. Hammer Strength is used by most pro sports teams and the top college athletic programs, which makes it an ideal choice for those who want to train like an elite athlete.