i'm not trying to troll here at all guys. like i said, i'm not that great, i just never really understood what people were talking about. i do, however, wonder if i would feel a different = "more painful" muscle fatigue if i were to expend myself at low altitude and be able to fuel/deplete my legs more fully. up here, 6-7000 feet i just feel like, oh wow, i can't go any faster, damn.