And how exactly does it work? In short, the thermoplastic urethane bands act as simple springs. As an athlete moves, energy is stored in that spring, and that energy is then released as the athlete returns to the original position, providing a small, but statistically significant, push. Squat down while wearing the shorts, and the elastic nature of the bands is immediately apparent. Adidas has studied different sports to find optimal locations where the bands can provide benefits without restricting motion. But who says the additional effort put in to stretch the bands is any less valuable than the energy spike as the spring releases?