Stand tall with a neutral spine and your feet hip width apart. Hold a barbell in your hands with an overhand grip and hands slightly wider than hip width apart. Raise the barbell upto your shoulders, so it's resting just below your chin with your palms pointing up. This is the start position. As you exhale, push the barbell up and directly over your head by extending your arms. Do not lock out your knees but be sure not to use momentum from your lower body to push the barbell overhead. Think about initiating the push from your elbows as opposed to your hands. Slowly return to the start position inhaling as you do so. Repeat for the required number of reps (or time).