I workout on a treadmill about an hour a day on average. Lately I've noticed that i'm losing muscle definition and my workouts are getting more difficult. I'm wondering if I could be over-training or if anyone has any idea what else might be causing this... I eat pretty healthily and take multivitamins and all that... I do get very little sleep, maybe my muscles aren't getting time to recover? If it is overtraining, how do I correct the problem? Any advice would be greatly appreciated, I'm at a loss as to what I should do. Thanks!