Ok, so i live in Seattle and my commute is about 13 miles in the morning, and about 17 miles at night (i go around the big hill/busy street on the way home). I've been going 2 or 3 times per week, but i have yet to commute on consecutive days. When I started this spring i was not in good shape, and though i've improved my average speed & time, my legs are still quite sore on off days (sometimes more than others). What i'm wondering is, is there benefit to pushing through the pain and going on consecutive days? Will this cause me to turn a corner and be able to go full time? I don't mind some extra pain if it means i'm really improving my strength, but I don't want to push myself too hard and wind up going backwards in my conditioning. What's your experience? Was there a big difference once you started biking every day?