Warming up before riding gets your body ready for the effort it’s about to exert. The idea is to gently move one’s joints through all their ranges of motion. Afterwards, stretching when your muscles are warmed up is aimed at mobility as well as stretching muscles out to avoid poor muscle function or imbalances. These warm ups came from the LIVESTRONG web site…I put them all on one powerpoint slide for easy access.
If you’d like a PDF of these for your phone, email me: firstname.lastname@example.org.
Here’s the link to the original livestrong site: http://www.livestrong.com/slideshow/1010730-stretches-before-biking/#slide=11