Here's a variation of the "Monster walk" but to travel forward rather than sideways. When you do a regular hip list, your waist on the side of the lifted leg shortens as that side of your pelvis comes closer to your ribs. In this variation, try to hold one side of your body stiff like a plank so your waist doesn't shorten, and when you lift the leg, tilt the whole body to the side. It's another way to practice the hip list emphasizing control of the lateral hips, but it looks a lot like the classic Frankenstein's Monster's walk!

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