Sitting on the machine with both thighs in contact with the seat, place the lower part of the tibia against the sleeves so that your knees are at a 90° angle. The back should be straight or slightly tilted back and supported by the backrest. Fasten the handles on each side of the seat to ensure stability. Inhale a little more than normal and exhale as you extend your legs. Hold for 1 or 2 seconds. Exhale and slowly bring legs to starting position. Repeat the movement making sure to maintain the tension in the muscles at all times.
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