A trainer recommends making this simple tweak to your upper-body workout to make it more effective

A woman in an apartment exercises on her knees with dumbbells. She is kneeling, with her body erect, and a pair of light dumbbells held out at her sides. Behind her wee see a reclined chair and a large glass window overlooking a green field.

Contrary to popular belief, you don't need heavy dumbbells to strengthen your upper body. Light weights are sufficient to challenge smaller muscles, like those around your shoulders.

This upper-body session from Sweat trainer Britany Williams is a great example of a lightweight routine. It's a barre-inspired shoulder workout, designed to improve muscular endurance (your muscles' ability to repeat a particular exercise or movement).