Dear Brinda,
Skipping is just another form cardio. It helps if you can sustain skipping for more than 20 minutes, at least. It's better to do some other form of cardio, as skipping not done properly can be bad for your knee. But, skipping really works, if you do it safely ... Please find below the simple way to do skipping without injury ... hope this helps you ...
Regards, Suni...
YouTube - Rope skipping with fitness pro Lyen Wong