What is "situp"

Usage examples of "situp".

Running in place, stretching, doing situps and pullups, Maia drove herself until a warm, pleasant ache spread from her shoulders to her toes.

He placed it firmly out of his mind and walked on, thinking of pushups versus situps and wondering if the bookstore had gotten his texts in yet.

Maybe after sixty situps every morning for the next three weeks he could join Jim Palmer in a Jockey ad.

In my opinion, he should have been doing situps for the gut he sported.

So he began doing pushups, situps, and knee-bends during class breaks.