It's standing in between 2 people who are holding a rope and twirling it around as you jump over and under it.
Something people use to do back in the day before smart phones and the internet.
Rope used for skipping
also it,s used to increase your height as most reliable way.
Skipping rope is basically a tool used in the activity where one or more participants jump over a rope swung so that it passes under their feet and over their heads.