Hi, I'm new to cathe.com and would like to try one of her tapes but don't want to get in over my head. At 53, I consider myself an intermed. exerciser (bike/weights/tapes 6 days per week). I'm in decent shape but have arthritis and bursitis in one hip. I know, I'm way to young for that! Anyway, tapes using a step or heavy on lunges are painful and difficult to execute. Squats don't bother me. So where do I begin with a Cathe tape?