Barre is also a great workout experience and puts you through some tough moves to really increase your muscle strength and flexibility. Barre classes usually start with a warm-up where you use very light weight, and your body weight, to work your upper body muscles. Then you work with your abs, legs, and seat to burn out those muscles, as well. Barre is great for activating muscles in your core, and the much smaller muscles that you wouldn’t normally work.
Again, talk to your instructor before class and let her know what you can do easily and what might be difficult. Personally, I have a hard time using my hips, because those joints are always sore. So I just tell my instructor before class, “Hey, I have a hard time using my hips,” and I'm always shown a modification or two.