Do not perform barre exercises if you have back problems, have had knee injuries, or any other injury that may prevent you from using the barre properly. Talk to your ballet or dance teacher before using the ballet barre. Do not use the ballet barre unsupervised, especially if you are trying exercises for the first time. Have a teacher or another dancer watch you to make sure you are performing the exercises correctly. If you have any questions about ballet barre exercises and whether or not you are physically able to perform barre exercises, talk to your doctor.