The overhead barbell press increases upper-body strength, specifically in the shoulders and triceps. The movement also improves core stability.
Grab a barbell using an overhand grip with your hands slightly wider than shoulder-width apart. Stand up tall with your feet about hip-width apart and the bar below your chin, but above your chest with your palms facing the ceiling.
Press the bar overhead until your elbows are completely locked out before slowly returning to the starting position.
Avoid hyperextending at your lower back. Keep your core tight throughout the entire exercise to prevent injury.
Be sure to press straight above your head and not out in front of your body.