Are my 3lb dumbbells useless?

DixiedoesMFP

I don't think they are useless per se, but I bet you are underestimating how strong you really are. Think about what you do in a typical day...lift groceries, lift kids, lift boxes, lift the laundry basket, lift the laundry detergent, etc. I would try a heavier weight. However, if that truly is the heaviest you can lift, then no, not useless at all.