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This exercise works the core muscles and the oblique muscles but also the shoulder muscles and the whole lateral chain participates in it. Lie down on one of your sides supporting yourself on one of your forearms, placing one of your legs on top of the other. Lift your torso from the ground. Pay attention that your hip should be up, pelvis little bit pushed to the back, buttock is firm and your body should constitute a regular straight line. Extend your arm above your head. In the beginning it is enough if you hold the position in a static way, later you can make the exercise more difficult with leg raises or knee pulls. Pay attention that the elbow of the supporting arm should be directly under your shoulder and you should keep your head in the middle as the extension of your spine. Perform the exercise to both sides.