You’ve made it to day 4! We’ve worked your abs, glutes and arms, so now it’s time to get those legs! Check out celebrity trainer Ray Grayson (T: @shutupandtrain) and Myleik as they show you how to execute mountain climbers with a travel step. If you’re at home, in your office or in a hotel room, you might want to keep your shoes on to avoid sliding all over the place. Do three sets of four.

Remember, we want you to add the exercises from Monday, Tuesday and Wednesday to today’s exercise. Make sure to join the conversation on Twitter and Instagram @curlBOX. U15 Minutese the hashtag #15minfitnessfix.

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