1
Sit on a weight bench with back support, positioning your torso upright at approximately 45 degrees. Place your feet flat on the floor with knees bent at 90 degrees. Position the dumbbell across your lap, holding it securely with both hands near your thighs.
2
Grip the dumbbell firmly with both hands positioned near the center, ensuring a stable hold. Engage your core and maintain an upright posture with shoulders back. Keep your head neutral looking slightly upward.
3
Slowly lower the dumbbell by extending your knees, allowing your legs to straighten toward a horizontal position. Control the descent by resisting the weight's downward pull through eccentric contraction of the quadriceps. Stop when knees are nearly fully extended but not locked.
4
Drive through your quadriceps to lift the dumbbell back up by flexing your knees, returning your legs to the starting bent position. Squeeze the quadriceps at the top of the movement for one second before beginning the next repetition.