Sit-ups and crunches both target your core muscles, but work differently. You can use both exercises to build strength, endurance, and control.

Your abdominal muscles are resistant to fatigue, according to the IDEA Health & Fitness Association, a membership organization for fitness and wellness professionals. As part of your core muscles — ...

The classic sit-up is a workout staple. Whether you've become all too familiar with the movement in your weekend HIIT class or eked out those last few reps while following a home workout video, you've ...

When most people think of core exercises, they think crunches and sit-ups – possibly because the tactical professions have used them for decades. But given recent changes in military testing, the next ...