The crunch machine comes in many different versions and under various names. From ab press to ab machine to sit-up device.

Sit-ups can be a great way to strengthen your abdominal muscles that sit around your stomach. But they can quickly get repetitive and its easy to accidentally lose your form, so when boredom strikes, ...

The rowing crunch completely replaced sit-ups in my workout routine — here’s why and how to do it.

When you think about wanting to train your abs, one of the first exercises that comes to mind is the crunch. Crunches are ...

Add Yahoo as a preferred source to see more of our stories on Google. Unlike regular crunches, which require lifting the upper body off the ground, reverse crunches involve lifting the hips and legs ...

Looking to amp up your core workout with a move that really targets those stubborn lower abs? Enter the reverse crunch. This exercise zeroes in on those hard-to-reach lower abdominal muscles, helping ...

Looking to amp up your core workout with a move that really targets those stubborn lower abs? Enter the reverse crunch. This exercise zeroes in on those hard-to-reach lower abdominal muscles, helping ...

Workout regimens often flame out as quickly as it takes them to start trending. But others can stand the test of time. Exercises like tai chi, running, swimming, hiking and yoga have been around for ...