Having astrong coreisn’t just about having a six-pack, though that can be a nice side effect.
That means that pretty much all other physical activities are easier to do when you have a strong core.
They’re both great options, and both have their celebrity fans.

Hailee Steinfeldtold Kelly Clarkson on"The Kelly Clarkson Show"that she does 3,000 crunches per day.
AndMaria Menounosswears by daily sit-ups.
“I have this one little routine that anyone can get through,” she explained toHealth.

But while sit-ups andcrunchesmay seem like basically the same thing, they’re not.
Here are the important distinctions.
But overall, crunches are a more isolated exercise compared to the sit-up.
Every body is different, so choose your sit-up or crunch based on what your body can safely do.