It's nice to have access to a load of different weights, but one dumbbell is all you really need to strengthen your entire body, as long as you have a good workout to do with it.
This six-move workout from fitness trainer Kat Boley is definitely one such workout. Using one dumbbell, it works all the major muscle groups in the body in just 20 minutes, and along with building strength, it will also boost your cardio fitness thanks to the fast pace.
