So far my endurance is way up. I can't make myself breath hard jogging or on the rower. EPO is not a fat burner. If anything I think I'm burning less calories. Im still fat just much faster. A few people have commented that I look red. I don't necessarily feel better either. I still feel like ****, only difference is I am hauling ass when I swim. I think there is some truth to the tissue repair thing because I have been swimming like a machine but my shoulders feel fine. Normally when I swim this much my shoulders are wreaked.