Sit-ups bring back memories of elementary school gym classes, but that doesn't mean you shouldn't embrace this exercise. It's exceedingly easy, but also extremely effective in building muscle mass and helping to shed off extra weight. Sit-ups can be performed easily from your own home. Simply lie down on the floor with the knees bent. Optionally, you may place a small weight on the feet as to prevent movement. Then, engage the core muscles and lift up the torso as to pull up the upper body, nearly reaching the knees. Lower the body back and repeat.

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