Nike Zoom Gravity Echo Pink The Nike Zoom Gravity is a lightweight trainer designed to help you outrace your competition. Progress from quick tempo runs to winning races. Snappy forefoot propulsion and grippy, multi-surface traction combine to give you the chance to perform your best. A Fast Response Zoom Air in the forefoot gives you low-profile cushioning with a propulsive, snappy feeling, while the rubber outsole directly underneath creates a springy sensation.