How do you work in your garden with arthritis or decreased muscle strength in your hands?
I went to my local bike shop and asked if they had any bike grips they were throwing away. The bike store owner gave me one and I wedged it on to the handle of the trowel, and it became a softer, cushier grip making it super comfortable to use.
Or you can simply wrap any tool handle with a cushioned tape (like a baseball tape) and have the same effect.