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The finger flexor muscles and their joints, tendons, pulleys and ligaments are one of the most complicated biomechanical constructions in the human body. Because the tendons of the hand and finger joints span up to 5 joints, hand movements are very complex.

For instance, when the finger joints are flexed altogether, the fingertip draws the outline of a spiral. With this movement, every single joint's axle as well as the common axle changes constantly.

TURNTILLBURN solves the problem of constantly changing axle positions: The finger joints are flexed one at a time rather than all at once. As you hang from TURNTILLBURN by your fingertips and start rolling in your fingers, you will realize that initially, only the distal inerphalangeal joints are flexed. As soon as these joints are fully in contact with TURNTILLBURN, the proximal joints (proximal interphalangeal joints) start flexing, and so on, until TURNTILLBURN is rolled in completely. At the end, your wrist rolls in to complete the movement. This way, the entire range of motion of your finger flexor muscles is exercised and prepared for the application of force when flexed at different angles.