10 Best Exercises For Killer Abs

6. Leg raises

Leg raises are the most effective abdominal exercises and also one of the most difficult. They focus primarily on the abs, but also have secondary benefits for your entire core and your upper arms and shoulders. This exercise targets specific areas when you’ve already achieved a high level of overall strength. Start with five sets of three to five repetitions, working your way up to 15 repetitions per set.