– Rubber bands start cracking after a few days or weeks, so you can add more rubber bands where you find cracks on the ball.
– To keep it safe for a long period you can put your ball in refrigerator.
– If your ball gets too bigger that you cannot wrap a small rubber band on it, then join two or three rubber bands and tie it around easily on the ball.
– Ask your friends or colleagues to give you rubber bands if they have some and they do not want to use them.
– Image Courtesy: instructables.com