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Primary Muscles: Rectus Abdominis, Multifidus, Transversus Abdominus, Rectus Femoris, Vastus Lateralis, Vastus Medialis, Psoas Major, Gluteus Minimus, Piriformis
Secondary Muscles: Erector Spinae, Biceps Femoris, Semitendinosus, Semimembranosus, Gluteus Maximus
A difficult movement, but fun once you get the hang of it. To make it easier, use your arms with or without a weight until you can progress to not having to swing your arms.