Sit on a chair with a high back at a 45-degree angle (support your lower back with a cushion). Hold a 2kg weight in each hand and lean back, arms bent at shoulder height, palms facing forward and your abdomen contracted. Inhale and then exhale as you reach both arms forward, squeezing your chest, until the weights touch at chest height. Return your arms to the starting position slowly. Repeat this 10 times, working up to three sets.