"Although a cyclist's legs provide the most tangible source of power, the abs and lower back are the vital foundation from which all movement, including the pedal stroke, stems."
some links...
- http://www.bicycling.com/article/0,6610,s-4-20-15681-1,00.html
- http://bicycling.about.com/od/trainingandfitness/a/pilates.htm
- http://bloombikeshop.com/bodyweight-exercise/
