Fins Fins Tyr Splitfin. Unlike conventional training fins that force the foot to push water in a flat plane (like an old paddlewheel), The SplitFin blades slice through the water with two winged surfaces, creating lift and forward propulsion (like a propeller). Engineered to evenly distribute resistance during the upswing and down thrust motions of the kicking cycle, the LFSPLIT Training Fins operate more efficiently than paddle bladed fins by mimicking a users natural kicking cadence and work both muscle groups equally to help build leg strength and maximize power output. Designed to function optimally with a tighter, higher frequency kick, The SplitFin Training Blades help simulate the natural turnover rate an athlete can only achieve at race pace. The unique, flexible split blade allows sustained intense training over the course of your workout and helps reduce the ankle strain, fatigue and cramping often associated with the use of conventional paddle fins.