1. After setting up the rack, lie flat with your glutes / butt fully on the bench, with your feet flat on the floor. If you are able to pull your heels behind your knees, this could be more beneficial for leg drive, but some are not able to due to hip flexor mobility.
Grip the barbell with an overhand standard grip, and unrack the bar, pushing straight up. Keep your head in a neutral position throughout.
2. Take a breath in, engaging your core to stabilize your midsection and hold that breath. Activate bend at the elbow, resisting the load as it moves towards the middle of your chest (sternum area). The bar travels from your mid chest area to lower sternum — either touching your chest or stopping just shy of it.
3. Keep your abs engaged and place tension through your chest and triceps to extend at the elbow, straightening your arms. Move the bar away from your chest toward the starting position, exhaling or breathing out as you do so. Hold the top position for 1 second to reset your breathing and find stability.
4. Repeat step 2 & 3.

NOTE: Muscles of the lower body act as a contact point with the ground to help with the leg drive of the exercise.
Maintain tension in the lower body to create more force towards the upper body and creating more stability for a safe exercise while adding load.

Make sure to not flare your elbows too high and aligning them with the bar path (straight out to the sides).
The bar should not bounce off of your chest at the bottom of the movement.