There are very few fitness goals you can't work towards using a rack of dumbbells, and dumbbells are especially effective at building upper-body muscle. If you know what you're doing you can squeeze in an effective session in as little as 20 minutes, as this workout from PT William Wolf shows.
"This short but efficient dumbbell workout is designed to target all the upper-body muscles. The workout can be completed in the gym or at home if you have a pair of dumbbells and a bench or flat surface," says Wolf. "Two well-balanced supersets limit the need for rest, ensuring you get the most bang for your buck as far as time is concerned."
