I suggest you buy dumbbells, dumbbells with adjustable weight. 1, dumbbells don't take up space, (it is estimated that you practice at home) and it is relatively convenient to move in the future. 2. Dumbbells can be paddling with one arm, and the left and right sides can be done separately to avoid uneven stress with barbells. 2. Dumbbells can move more than barbells. Of course, it's not that barbells are bad, each has its own advantages and disadvantages. The best action in back training is pull-ups.