I am a diabetic, asthmatic and have cardio myopathy (enlarged heart due to high blood pressure). I exercise as much as possible. I am an avid cyclist. But - I lose energy, get muscle weakness and I have trouble climbing hills on my bike. My medical conditions are well controlled but I'm always the last one in the group, and always the last one up the hills. I'm thinking that it might just be all in my mind... does anyone else have any of these problems?