In particular, the group of lower abdominal muscles along with the hip flexors will be worked with this exercise. Still struggling to hold it? Knees to chest. Lift your legs so they are at a right angle to your body. Toes to Bar. Parallettes are great for beginners and fitness veterans. We also use cookies to help improve our advertising methods through Google's advertising network and on social media. Dynamic leg raises work the ab muscles isometrically and mainly target the rectus abdominis muscle and the internal and external oblique muscles. We hate spam! As your knees come to your chest, ever so slightly roll your upper body down toward your knees and crunch. If, on the other hand, you are looking for even more of a challenge with this exercise, you can try wearing ankle weights as you perform each rep to add additional resistance to your abdominal muscles. For more information on what data is contained in the cookies, please see our Privacy Policy page. Have a read of this great guide over on GMB.