I commute to and from work each day. The trip is about 7mi each way or 20 min. A couple of miles are "false flat" to slightly uphill. I do endurance training on the weekends (Back to back 4-6 hr rides usually). I've noticed that my fatigue level has increased as well as leg soreness, I find myself skipping some after work rides now that i'm commuting. I don't understand how such a short ride is sapping my energy....? Maybe i should just plod along instead of in the drops redlining it. Tell me if all of this sounds dumb. It could be all in my head...