Thread: Chest Exercise with the Pilates Circle

Lie on your back with your legs bent. Keeping your stomach firm, hold the Pilates circle between your hands. Your shoulder blades should remain on the floor throughout the exercise...

Exercise: Chest Exercise with the Pilates Circle - Fitness.com

so the ring flexes? or is this an isometric?
I watched the animation and couldn't tell for sure.

guess the question is- do we need a "pilates" ring? I don't know squat about a pilate.

The ring does have some flex... You could do this as an isometric exercise using something like a soccer or volleyball. So no, you don't really need the ring.