1
Sit upright on a sturdy box or bench with your torso perpendicular to the ground. Place your feet flat on the floor with knees bent at 90 degrees. Maintain neutral spine alignment with shoulders back.
2
Keep hands positioned near head with palms open and elbows slightly bent. Engage core muscles and ensure full contact between buttocks and the bench surface. Take a deep breath to prepare.
3
Slowly extend both legs forward in a controlled manner by straightening the knees. Drive through the quadriceps while maintaining upright posture. Exhale as legs approach full extension, reaching a 180-degree knee angle.
4
Hold the extended leg position briefly at the top for maximum quadriceps contraction. Return legs to starting position by bending knees in a controlled manner, lowering back to 90-degree knee bend. Inhale during the return phase and repeat for prescribed repetitions.