It only takes four moves and 16 minutes to grow shoulder muscle and build a stronger upper body

A woman holding dumbbells doing a home workout

You might think you need the gym and several expensive weights machines to build upper body strength, but that's not always the case, as this short dumbbell routine shows in just 16 minutes. 

This muscle-building shoulder workout from NASM-certified personal trainer Sadie Lee Thomas is the perfect example of why simple is sometimes best—all you need are four moves and two dumbbells.