can i combine jumprope & cycling/running

hi my friend is a boxer and says he cant be a top swimmer and a boxer. cos they are to fysically different. i want to know is it safe to do a lot of jump rope when doing a lot of running and or cycling.
i started and noticed my calf going in to a diferent shape for each exercise.
am i headin for truble.:animal3:
 
hi my friend is a boxer and says he cant be a top swimmer and a boxer. cos they are to fysically different. i want to know is it safe to do a lot of jump rope when doing a lot of running and or cycling.
i started and noticed my calf going in to a diferent shape for each exercise.
am i headin for truble.:animal3:

No, he can't be a top swimmer and swimmer because the training demands are different. But, that doesn't mean he can't be a very good, competitive swimmer and boxer at the same time.

There is no harm in jumping rope, running and cycling.
 
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