I rode my first 37-mile fund raising ride last Sunday (September 14). I had no problem keeping up with our ride leader. We averaged a speed of 15-16 mph. There were several gradual up hills. (I've been taking spinning and aerobic classes plus riding my bike on my own to train for the ride.) I felt fine and energetic (save for a slight headache) when we finished the ride. But later that evening I was EXHAUSTED and have been ever since. I went to bed early Sunday and Monday night, but couldnít get out bed the Monday or this morning without a struggle. I have no energy at work. I went out my car on Monday and today and took an hour nap! Any ideas to help me become a part of the living world again? How can I prevent this in the future? I have done solo 25+ rides but donít remember being this tired.