"Gunnar Peterson is the man who shapes the bodies of some of the most famous female stars on the planet — especially the Kardashians," YouTuber Hanna Coleman says. "His training methods are proven to help you achieve all of your fitness goals and so many people swear by him. My goal for this challenge is pretty simple. I'm looking to change up my everyday workouts, see more definition in my ab area and my overall strength."

Learn the jump rope exercises that helped her do just that!