What can I use instead of an exercise ball?

10 Better Alternatives to Crunches and Sit Ups

For those who like to use a small workout ball during sweat sessions, Nolden says she uses a circular pillow that provides a similar result. Or, if you don’t have a pillow that works, roll up a towel and use that instead.

Because of its ability to target the entire core, the Swiss-ball crunch should be a staple in your workout. The exercise primarily works the rectus abdominis, or six-pack muscles, and the transverse abdominis . But when performed properly, it also calls on muscles that stabilize the hips and lower back.