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You should have about 1.5 to 2 feet (0.5 to 0.6 m) of loop available to you. The foot with the band on it should be on the outside, not the side with the chair.
Loop or tie one end of an elastic exercise band around the leg of a chair or another piece of furniture. Tie or loop the other end of the exercise band to your foot, and stand sideways so that the chair is at your side.