Is sit-ups useful for weak arms?

Useful.

Sit-ups are something that everyone likes to do, both boys and girls like it very much. Because it can exercise the abdominal muscles, you can not only develop the vest line, but also the waistline.

When using a sit-up tensioner, you need to exert force on your waist, legs, hands and other places. Moreover, the function of the sit-up tensioner is quite large. It can not only train the vest line, but also slim down the legs and arms. So the key lies in how you use it yourself. As long as you use it correctly, you will definitely get in good shape.