Power in cycling comes from your gutes, this exercise can serve as a great test of glute strength.
Coach and personal trainer Nick Tumminello of PerformanceU shows you one of the core training exercises he developed called the "Superdog". The exercise is a cross between a "bird dog" and "superman" exercise. Visit PerformanceU for great strength training tips and videos.
"Superman Bird Dog Combo"
Another great core exercise is the "Upright Bird Dog"