The Truth About Crunches and Sit-Ups for Your Abs.

Personal trainers recommend a combination of consistent cardiovascular exercise, high-intensity interval training, and strength training, with a healthy diet and overall lifestyle habits for burning stomach fat and building muscle. While both crunches and sit-ups target the abdominal muscles, crunches are better for training your six-pack abs and sit-ups train your hip flexors. Neither workout alone is very effective for reducing stomach fat.