What Jiffer said. I also noticed when starting riding with a group, that it's ALL about successful drafting, and keeping that small gap means a lot of focus and a lot more small quick accelerations that I had been used to when riding on my own. Alone I can just slowly crank it up until I'm going as fast as I'm up to, no barriers around me, and then regulate my speed to the terrain and my fitness level, but training with a large group I found myself braking and accelerating a LOT more, and having a much jerkier, tiring ride. I got used to it and got faster reflexes and more relaxed about close quarters after a while, but one consequence was that I never knew where we were or had been training, because I'd spent 2 hours intently focussing on the exact position of the rear wheel of the guy in front of me...
Winter riding is much less about badassery and much more about bundle-uppery. - malkin
1995 Kona Cinder Cone commuterFrankenbike/Selle Italia SLR Lady Gel Flow
2008 white Nakamura Summit Custom mtb/Terry Falcon X
2000 Schwinn Fastback Comp road bike/Specialized Jett