Natural Mature Thumbs -

: The ability to bend the thumb backward at a 50-degree angle or more is a recessive genetic trait. Our Aging Thumbs - Occupational Therapy Services - WashU

: Avoid "Bending, Lifting, and Twisting" (BLT) movements that strain the thumb base. Occupational therapists from the Milliken Hand Rehabilitation Center recommend these stabilization techniques to keep thumbs functional as they mature. 3. Addressing Genetic Shapes natural mature thumbs

Some thumb features are purely genetic and cannot be "developed" through exercise: : The ability to bend the thumb backward