A man using a round soft workout pillow to perform elevated sit-ups.
A man is doing crunches on a half exercise ball.
a man does sit-ups while sitting on a large exercise ball
The man with the clean shaven head is using a hand weight to do sit-ups on a blue exercise ball.
A man in a gym with maybe a trainer on a balance ball doing sit ups.
A blald man is doing sit ups while sitting on a blue exercise ball.
a man sitting on a ball while doing some situps
A man finishes a set of abdominal exercises on a lower back support.
A man does sit ups using an exercise ball as his coach spots him.
Bald man in a grey shirt doing situps off a ball on the ground for exercise.