Yea, you can actually gain alot more then that, I have a friend who does skipping everyday about 1200-2000 skips a day and he stayed consistent for about 4 months or so and he gained like 6 inches on his vertical and his stamina is so amazing now, he can run 4 laps around our 400m track at 75% speed with out stopping, skipping rope is a really good way if you wanna increase your vertical.

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Height:6'3
Standing vertical: 24
Running vertical: 27