Are you confused between crunches vs Sit ups? If yes! Then Here's the definition for both! A sip up is 1 kind of exercise in which strength the abdominal muscles and the hip flexors and it also provide strength to neck, chest and lower leg and lower back muscles. Whereas, https://kyleorrblog.wordpress.com/2018/03/01/muscles-why-are-these-the-most-beneficial-things-in-the-body/