Dominately calves, followed by quadriceps(front thigh) a bit of
hamstring and backside muscle here and there.Skipping ropes are
used for cardiovascular conditioning.
If you want to build big leg muscles, do 100m sprints sets and
squats.Whoever tells you to jog long distances to get big leg
muscles must be kidding.You see sprinters with big legs but you
hardly see a long dist runner with huge legs.