Soldiers trying to earn the Army Ranger tab will have to do more challenging functional fitness exercises starting day one.

Sit-ups tighten and tone the abdominal muscles that run from beneath the sternum to above the pelvis. This results in a flatter stomach and, if practised along with plenty of aerobic exercise ...

Sit-ups often come to mind when you think about working your abs or strengthening your core. It’s one of the most old-school, ...

1. Sit-ups strengthens core muscles People who do sit-ups witness a significant increase in their abdominal muscle's activation, according to a 2016 research published in the Journal of Physical ...