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

The "mature" look of a thumb often comes from a well-developed (the fleshy muscle at the base). You can increase this size through high-resistance training: natural mature thumbs

: Use small finger bands to practice "thumb abduction" (moving the thumb away from the palm) to build the outer muscles. 2. Maintain "Mature" Health & Shape : The ability to bend the thumb backward

Some thumb features are purely genetic and cannot be "developed" through exercise: natural mature thumbs