How to do it: Stand tall with your feet hip-width apart. Clasp your hands together in front of your chest. Extend your arms ...

If you complete 100 abdominal crunches a day, you might build a little muscle, but more likely, you’ll be left with sore muscles and not much else. The crunch and its relative, the sit-up, can each ...

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 ...