A weighted sit-up keeps your ab muscles and core stabilizers continually challenged in a way that helps build strength. The sit-up is a classic for a reason: When done correctly, the deceptively ...

This article breaks down sit-up variations for every fitness level—beginner, intermediate, and advanced, to boost core ...

Exercises like weighed sit-ups and lying leg raises can help build defined abs, physique coach Cliff Wilson said. You should train the abs like you train any other muscle by adding resistance, he said ...