Yes, 1-pound weights CAN build muscle!If you use them the right way.

We don’t require heavy weight to stimulate muscle growth—it just makes the process faster and more efficient. Light weights tend to produce the biggest gains in beginners, those recovering from injury, or when working smaller muscle groups. For example, doing leg presses with one pound would take a long time to build quad strength, but using one-pound weights for shoulder work can absolutely make a difference.