The bones are brittle and a little hard. You can practice Sanda to keep fit, but you can't participate in the competition! And you have to have a physical examination before the game. This condition should not be tested! So is dancing. You can dance if you want, but don't move too much! If you are flexible, you can try to dance folk dances. If you are not flexible, you can dance hip-hop and hip-hop, but remember "Don't move too much!" (Personal opinion, for reference only)