I concur, there is certainly a point where we are doing too much. You need to have the right balance between work and rest - and too much can also make injury more likely. My coaches and nutritionists keep reminding me that exercise is good for many things - but not weight loss. THAT is diet, and you need to fuel your body properly for both your activity level and recover. Over-training is so easy, I've had issues with that since I got off the couch. What is your ultimate goal, weight loss or fitness? It is very difficult to gain muscle while trying to lose body fat.

I do 3 hours a week of cross-training that looks very much like Crossfit - if I were to attempt to ride 100 miles a week I would quickly be on the injured list. These days I focus on my group training, and supplement that with riding when I can and some trail running/walking. Like Crankin, my gym work IS stressful to my body but I need the bone building and muscle.