Instructions
Loop a resistance band around an anchor point like a fence railing or even a small tree. Place this at just above knee height.
Place a chair in front of the band, but far enough away to create tension on the band, when it is attached to your leg.
Sitting upright on the chair, loop the band around one ankle and have the other foot planted firmly on the ground. Grasp the sides of the chair with your hands for support.
Curl the leg with the powerband attached, in towards your body as much as can, then release it back to the start position. Repeat for the desired number of reps and then repeat on the other leg.
Tips
Move further away from the anchor point to create more resistance, or set yourself closer for less resistance.