Sit upright in the leg extension machine and position your legs under the pad (Grab the side handles for additional support).
2. . Right now your knees should be flexed to 90 degrees and your lower back and shoulders should be in contact with the back pad.
3. Extend one leg until your shin is aligned with your thigh. Hold the contraction for a moment and slowly flex your knee back to the starting position.
4. Perform the movement for the required number of reps and once finished, repeat the steps with the other leg.