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Best Muscle-Building Ab Exercises: 1.  Hanging Leg Raise Or Knee Raise Why it made the list:  There are many reasons to like leg raise variations, but one is their scalability. You can start doing bent knee raises in the Roman chair or ab straps to focus on the lower core, work up to straight leg raises, and then move to a hanging bar. By the time you can do full straight-leg toes-to-bar raises, your entire core will have strength for days. That's not the only way to progress, though. You can also increase the degree of difficulty by holding a medicine ball between your knees or ankles, which allows you to train in a lower rep range. No matter the variation, get your legs as high as possible on each rep without using momentum to swing them up. Hanging Leg Raise In your workout:  Do this move first or second in your routine for 3 sets of 10-15 reps. If using a medicine ball, try a dropset simply by letting go of the medicine ball when you hit failure. 2.  Machin