Wrapping a resistance band around your lower legs is the workout that you will be performing. When you move your heels against opposition, your hamstrings will have to work extra hard to make the movement happen.
To perform a hamstring curl while seated:
Attach the ends of a resistance band to a solid item, such as a piece of furniture or an exercise equipment, and then tie the band to the object. Place yourself in front of the band. You should keep your feet together when you have the loop wrapped around one of your heels.
After you have reached the point where you are unable to go any further, bend your knee and bring your heel back.
To get back to the beginning position, you should extend your knee.
Do between 12 and 15 repetitions. Perform the same motion on the other leg.