Also, I should note, that while doing it it doesnt seem so hard. It's as soon as I get home at the end of the day that it really hits me. I mean, my last hour of work is a bit harder then the rest of the day and my legs are getting weaker, but basically I don't feel the exhaustion till I get home and sit down. I don't ever feel that burning pain in my lungs that comes from really riding hard and my legs generally don't feel like their gonna explode. When I used to go out on good hard recreational rides I would push myself so much more. Still untill I started couriering I've never had my legs jackknife on me while I was lying in bed. My legs at the end of a day are pretty messed up. I'm pretty sure it's all of the start stop that's causing it. I'm sure eventually my legs will be used to it but right now it's killing me. It's sunday and my legs finally feel normal again, and tomorrow its back to the grind.