The PURE KRAFT leg curl features a unique double-linkage mechanism, which perfectly adjusts the load profile to the natural strength curve and completely eliminates inertia. The diverging lying surfaces stabilize the body in the hip bend, so that perfect exercise performance is significantly enhanced. In addition, a 9-way adjustable leg roll allows for adjustment to different leg lengths. The two grips provide extra support, even when exercising with very heavy weights. An additional hook allows the use of an elastic band, which intensifies the resistance at the end of the exercise!