Resistance band double crunches combine the benefits of a regular crunch and a reverse crunch. This exercise is an effective way to contract the entire length of your abdominal muscles and hip flexors with a single exercise. Learn more about properly executing this exercise with the video above.
Regression
Make this exercise easier by crunching with one leg at a time, not advancing to both simultaneously, or decreasing your range of motion.
Progression
Make this movement more challenging by crunching with both legs simultaneously, instead of one, or performing more repetitions.