I'm a big fan of dumbbell exercises. You can do them at home or in a quiet corner of your local gym when all the machines are busy. Doing dumbbell exercises also allows you to isolate different areas of the body, which can help you discover and improve muscle imbalances.
This upper-body dumbbell workout from trainer Berenice Salazar features seven exercises that will help you build muscle in your core, arms and back. It's a circuit style session, which means you'll spend between 30 to 40 seconds on each exercise, performing them back-to-back before having a short rest after each round.
