[Supine dumbbell fly] mainly exercises the chest muscles.
Lie on your back on an inclined bench, holding a dumbbell in each hand, palms facing each other, and press until your arms are straight.
Hold the dumbbells in both hands and lower them to both sides in parallel, with your elbows slightly bent. Lower the dumbbells until you feel a full stretch in the muscles on both sides of the chest.
As the dumbbell falls, take a deep breath.
Exhale while holding the bell and lifting it back to the original position. Do 4 sets of 8-12 reps every other day.