• Sit-ups target your abdominal muscles, back muscles, and hip flexors, while crunches only target your abdominal muscles. • Neither sit-ups nor crunches alone burn abdominal fat. Overall activity and ...

Sit-ups may seem old-school, but they remain one of the most straightforward and revealing measures of real-world core strength. In just a single minute, you can test your endurance, mobility, and ...