Ever been amazed by the athletic physique of Marvel heroes and heroines, like the flawless Scarlett Johansson? It's common to ...

No matter which variations you follow, crunches have the advantage over sit-ups of being able to better target abdominal muscles. "Because the movement is smaller, you can control momentum more," ...

A great example is the butterfly crunches, which turn the ab-burning dial up on the traditional exercise to keep challenging you and your core. You’re now subscribed to all our newsletters.

Could you get back on your feet? If the answer is no, it’s time to start adding crunches to your workout routine to give your core the boost it needs. “Core work allows you the ability to pick ...

While most abdominal exercises are performed lying on the floor, these are right for everyone such as those who have difficulty getting up and down for example. The seated ab crunch provides a ...

Sorry, Well Workouts requires iOS 7 or greater, the Android Chrome browser, or Internet Explorer 11. Try going to www.nytimes.com/7-minute-workout on your phone. 12 ...

This article was medically reviewed by Joey Thurman, CSCS, CPT, FNS, a Chicago-based fitness expert and creator of Fast Results program. The main difference between sit-ups and crunches is the ...