Tough dryland

OK, I admit I'm not much for dryland in most cases. On occasion I'll do some pull-ups or push ups after practice, but usually I get out of the pool, shower and go home. Anyway, yesterday I was doing some pull-ups and my coach came over and said he had something new for me to try: jumping rope with a weighted jump rope. Anyone else ever try this? I did 5 sets of 40 reps on 1:00. Usually it took about 30-35 seconds to complete the 40 jumps, and let me say the rest was much needed after that! I'm not sure how hard it would be when fresh, but after a pretty tough swimming workout it was definitely challenging. I had never seen a jump rope like this before. It was a 4 lb solid rubber rope. It's a whole different experience than using a regular jump rope.