Just like some people usually crack when stretching their muscles and bones, you should not be insufficiently prepared for exercise before playing badminton, so that your muscles and bones that are not fully stretched will ring during playing. Don't worry, it's no big problem.

When playing badminton, you must do enough warm-up exercises, including lunge, head movement, wrist and ankle movement, waist movement, scapula movement and knee movement, to ensure that your bones and muscles are fully stretched, otherwise you may cramp and strain during playing. It is best to wear professional badminton shoes (with air cushion on the sole for shock absorption) and ball socks (to tighten the ankle and reduce the chance of sprain), and wear knee pads and wrist pads to protect the joints and reduce unnecessary injuries when playing.