A strong core for an athlete has almost nothing to do with visible abs. It's about transferring force between your lower body and upper body without leaking energy in between. Every throw, swing, sprint, and change of direction runs through your core. Untrain that job and power leaks out while injury risk climbs, especially in the lower back. Crunches train one thing, spinal flexion, which barely shows up in sport. The exercises below train what athletes actually use: bracing under load, resisting rotation,