It depends on where I am biking. If I want to do rides around my house, I tend to warm up on the trainer because once I leave here it is nothing but hills and more hills. Those absolutely kill me if I don't warm up first. So after warming up for about 10 minutes I will stretch out. But if I drive someplace for a ride I usually just get on and go. Then if there is a bathroom break or people need to stop I will stretch out a little bit. I definitely stretch afterwards. My back and shoulders would "talk" to me if I didn't...