It's a tough workout, relies on you to push yourself, and very worth the time and money. You can only be better off health wise after each class. OTF Cornelius has good, supportive instructors who watch to make sure no injuries due to improper form, and are excited to have you there and be there themselves. No judgey-ness. And the front desk ladies are awesome, they always seem to know everyone's names! Always have a genuine smile for you.