Keep a flat back and your core braced as you remain seated at the shoulder press machine. Look straight ahead as you grip the handles firmly. Slowly, press the handles up ovehead until your arms are fully extended. Focus on driving the weight up from your elbows, exhaling as you do so. Do not lock out your elbows. Slowly, bring the handles back down (inhaling as you do so) but do not let the weight stack touch. Repeat.