Home Health-Fitness 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. Repeat 3 times. If youre just starting out, practice balancing on your butt with no weights, in this position for 10 seconds straight and work up to adding weights!