I stopped doing weight training early in the base season, and concentrated on aerobic bike work instead. After going back to the gym recently, I noticed a distinct decrease in the amount of weight I could press, which seems to correspond to my deteriorating sprint. On the other hand, my aerobic fitness has increased dramatically.
It will be interesting to see if the strength I showed in the gym around September returns after this season. I sort of wish I had continued with my gym work, though. My legs are pretty puny at this point
Anyways, when I was doing leg work, I concentrated on squats, deadlifts, and leg presses. I also worked the hamstring a bit.