Yep, without the warm up, I am toast. So, if I want to ride my fastest, people have to put up with me going slow for about 10-15 minutes. I already told the leader of one of the weekly rides I go to that if she wanted me to lead on the days she inquired about, she would have to plan some warm up time in her rides so I did not always feel bad at the beginning. This is exactly the reason i am usually at the back for the first half of a group ride and then a switch goes on and I am usually at the front and feel like I could go on forever when others are getting tired. These people go out like crazy and then slowly die off...