Exercise execution guide
Barbell placed on the ground in front of you. Legs apart and feet in an outward pointing position while remaining aligned with your knees. Legs bent, thighs almost horizontal (depending on your morphology). Barbell grip in pronation, with hands shoulder-width apart. Torso slightly bent forward, back straight, shoulders pulled back and chest out. Inhale and tighten your abdominal muscles.
While keeping your arms straight, lift the barbell by extending your legs and straightening your torso to reach a vertical position. Exhale at the end of the motion. Then slowly go back to the starting position. Always remember never to bend your back.