Reverse Fly: For this motion that targets the rhomboids of the upper back, keep your back flat and a slight bend in your knees. Aim to get your arms just above the level of your chest, with your hands roughly out at the level of your ears.
V-sit-incline-press. This is a great exercise that combines core and arms:) Balance yourself on your butt with your legs in the air and your knees slightly bent. Pick up a weight of dumbbells that allows you to do 10 reps in a row.