When I started with Bill 5 months ago I had never played a sport, never exercised, and couldn't run a city block without getting winded. That first week of training, I definitely was light headed and out of breath a lot. But what's so great about Bill is that he incorporates nutrition lessons into his teaching, so I quickly corrected the things that were causing me to have such a hard time in class. Bill is great because he let's everyone come from their own starting place and never compares or judges where anyone is at. I like that I only have to work as much as I can on that day, at that moment. It's great self-motivation, with Bill always there to make sure postures are correct so that I don't unknowingly get hurt. If I ever do feel a pinch in a certain pose, Bill instantly knows which muscles, tendons, and nerves are at play - and what to do to fix it. His complete knowledge of fitness, nutrition, massage, and general positive outlook on life are fantastic!