I don't normally write reviews but since I've been nursing my left knee for about the last month I've been a little frustrated. I went to 3 group classes at this gym, my third class is when I sustained my injury. I have never had any knee issues. I was the only person in THE GROUP class, and I mentioned to Will I haven't worked out in about a YEAR. He encouraged me to do these lunges holding onto these heavy kettle balls ( and watched as I was losing my balance), a good trainer would of listened and set the pace at a moderate level. I should of listened to my body and let my rationale kick in and stopped what I was doing (of course, I must take responsibility as well). Folks, boot camp classes are the new trend, know your limits and don't let those words of encouragement distract you, I wish I would of listened to my gut and avoided the bursitis I now have in my knee.