Hi Cathe (or anyone else who wants to chime in!), I have been working out with my neighbor who is 59 and is a bit overweight. We have been doing many of the X-Train workouts and twice now after weights towards the end of weight workouts, she has experienced a feeling like the room was spinning and that she was going to pass out. It comes on extremely suddenly and the first time really wiped her out. She also said that sensation because even stronger when she moves her head during these episodes. What could possibly be causing this? Could it be overexertion? Dehydration? Or could something more serious be wrong with her and the exercise exasperates the condition? Thanks for the help!