I've decided to Jumprope as my new cardio excercise anyways I do it for 30 minutes before my workout everyday. The problem Is my legs get uncomfortably sore. I stretch everyday and I'm in very good shape. why are my legs getting this sore? The only answer I can come up with is that it might have something to do with the shock of jumping up and down on the concrete. Is this true? will it go away? thanks for reading this and any help would be greatly appreciated!