Sean McColl writes about warming up for competitions. He has some good advice that can be adapted to any climbing warm-up routine.
My 75 minute warm up starts with 5 minutes of cardio. You can do anything, jump up and down, go for a run, jump rope, anything to get your heart going. For the first 10-15 minutes, if your feet are cold just wear your street shoes, if not put on your climbing shoes, do easy moves on big holds. Iâ??m usually just trying to get the blood pumping through my arms so when I go and try harder moves, they feel easier. After you feel a bit warmed up, get your climbing shoes on and do 40+ moves on the climbing wall.