Bad? No way!!
Jumping rope is arguably one of the best, if not THE BEST exercise you can do. Jumping rope is a great way to lose weight, gain strength, gain endurance and relax the mind.
When starting out jumping rope, the best thing you can do is take it slow and RELAX. Relaxing when you jump rope is very important, it will you jump rope longer and become more efficient. Start jumping rope with a goal in mind of three minutes. After three minutes, take a break (I like to immediately do a set of weight lifting) then go back and do another three minutes. You can find more help on jumping rope from your personal trainer or take a look on youtube..