Lightweight Underload Training BatCustom Lightweight Underload Wood Training Bat Speed is trained not wished for. Our Lightweight Underload Training Bat is designed with a standard game profile but built at 9 weight, allowing hitters to move the barrel faster than their gamer while maintaining proper mechanics. The lighter load activates fast twitch muscle fibers, sharpens sequencing, and trains the nervous system to operate at higher speeds. Unlike gimmick trainers that alter swing