Set a bench to a 30–45° incline. Sit down holding a dumbbell in each hand, resting them on your thighs. Lie back on the bench and press the dumbbells up over your chest with a slight bend in your elbows. Palms face each other. Slowly open your arms out to the sides in a wide arc, keeping the same bend in your elbows. Lower until you feel a stretch in your chest — don’t let the weights drop too low. Bring the dumbbells back together over your chest by squeezing through your chest muscles. Keep the movement smooth and controlled. Repeat for the set number of reps, keeping your core tight and back flat against the bench throughout.