All muscle cells have the ability to contract enhanced by some type of increased physical stimulation. Aerobic exercises are designed specifically for strengthening the cells of the heart and the cells of the walls of the arteries making them stronger and more elastic. Skin cells are not muscle cells but they do react to various types of stimulation. Properly stimulated the cells of the balancing mechanisms become more sensitive to any and all body movement. Better balance, coordination, and rhythm are the result.
Vision is a talent and as such can be improved by exercise and proper stimulation.
From the time we are born until the time we die we are constantly exercising the cells of the eyes . Sadly we do not think of looking to see as a form of exercise so most people do not concentrate on exercising the cells of the eyes. Rather they prefer to compensate a weakness with glasses. Vision therapists have been using trampolining very successfully to strengthen the cells of the eyes and improve vision for over forty years. In the past, connective tissue , the ligaments and tendons were thought not to react to exercise, but now it is known that that is simply not true.