I am too busy behind the work so i don't have too much time spending in gym, i just have one pair of dumbbells. I used to run and swim every week, so my legs are strong enough. But mu upper body including chest, shoulder and arms are not strong. Now i start to do some dumbbell exercises , but i want to have one more for making some changes in my home workout.Is there one home equipment for upper-body building, not big, no need big space at home for it.