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"I have researched this move in my lab, and it is very effective at activating all of the abdominal muscles (the rectus abdominis, internal and external obliques, and the transverse abdominins), and yet the movement is very straightforward and does not require several steps or positions, says Michele Olson, PhD, professor of exercise science at Auburn University Montgomery.
"This move is also great for learning how to breathe correctly when engaging the abdominal muscles in order to get a very deep and full activation of the abdominal wall, and the ‘up’ position of the legs during the entire exercise greatly limits any action of the hip flexors."
To do it: Lie on the floor with your arms extended above your head and both legs lifted in the air at about a 45-degree angle. Inhale, roll your head and shoulders off the mat, press your ribs down toward your hip bones and exhale, lifting your entire upper body off the mat (keeping both legs up). At the top of the exercise, "land" your arms so that the arms and legs are parallel to one another. Then, breathe "naturally" while holding the top/up position for two slow counts. Reverse the action by inhaling and then rolling your back, shoulders and head down onto the mat exhaling at the start position.
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