Cleveland Clinic Foundation study: a muscle can be strengthened just by thinking about exercising it. For 12 weeks (five minutes a day, five days per week) a team of 30 healthy young adults imagined moving either the muscle of their little finger or of their elbow flexor. Compared to a control group – that did no imaginary exercises and showed no strength gains – the little-finger group increased their pinky muscle strength by 35%. The other group increased elbow strength by 13.4%. (Franklin Institute Article. "Turn on Your Brain. https://www.fi.edu/#mentalexercise)