For those of you who are short on time, the thought of dragging yourself to the gym for a 60-minute session might be a non-starter. All you really need is an effective dumbbell workout you can rely on to deliver fast. In 25 minutes, perhaps.

Although the actual muscle-building process (hypertrophy) takes several months, your workouts only need to be consistent and progressive to be effective. What I’m saying is, you can sculpt your back, biceps and shoulder muscles using a set of dumbbells and the correct exercises and intensity.

Over time, by mixing this 25-minute upper-body workout with other strength exercises, you can see results, whether you step foot in the gym or not. Just remember to keep progressing the workout — but more on that later. I’m a personal trainer, and I’ve developed

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