For anyone having trouble turning the bench knobs:
In addition to playing piano, I work out with free weights and do 4-mile walks for aerobics too. I'm 63.) There is an excercise which I include in my sets called "wrist curls". I put about 30 lbs. of weight on the bar, then sit on the bench (the pressing bench, not the piano bench

), with palms facing upward, fingers closed around the bar. Then with arms stationary and using the wrists only, curl the wrists/hands toward you, then release back to neutral position, repeating four or five times. Turning piano bench knobs will never be a problem again.