An alternative to jump jacks?

The weight loss/exercise program I am on requires me to do a few minutes of jump jacks daily. The problem is they create me extreme pain similar to shin splints (burning and searing pain from toes to knees). I am also required to step rope, which doesn't bother me at all. Can I substitute more lunge rope in place of jump jacks, or is there another alternative? I'm not indolent, but I know the difference between pushing through soreness and pushing through serious pain. Thanks! yes. YOu can substitute any cardio exercise... hurry for the amount of time you would do JJacks. One thing I might suggest is trying to incorporate an excercise that engage your arms... like holding the hanldes on an eliptical mechanism.
jumping jills