Go for it! I cannot believe how much I truly loved the kick-boxing class. I was expecting something akin to Tae-Bo. This was much different. Really aggressive, really tough. My entire core was engaged. I have a bad back and I was getting worried this would aggravate it. But the boxing stance seemed to lock my hips and low back in place--which is good. Afterwards I felt loose and limber--tired and exhausted--but loose and limber.