Like ballet dancers, their hamstrings have been broken, especially when they are old, their knees and joints will be painful, and in severe cases they will be disabled, just like athletes ...
You can't pull the tendons too hard at ordinary times, and strain may occur, especially to prevent muscle breakage ~ ~
Also, some dance movements are too intense and dangerous. Remind your friends to pay attention ~~
However, the chance of sequela is still very small. If you just jump for an amateur or just to cultivate your temperament, the chance is even smaller ~ ~
Actually, everything is risky, and the chance of sequela from learning dance is relatively small compared with other sports ...
I hope to give some reference value to your friends.