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I'm a big fan of functional training and accessible but effective workouts. Bang-for-your-buck fitness is my bread and butter, which means you spend less time exercising overall, but still get the many benefits that come from progressive, intentional and consistent training efforts at the correct intensity.I spend a lot of time explaining to clients that you don't need loads of fancy gym equipment, either, just the right weight selection and kit for the type of workout you want to do. And if you, like me, enjoy resistance training and lifting weights, you can master a full-body workout using just a set of the best dumbbells.Here's why you can pair it back with just one set of weights, plus a full-body dumbbell workout you can try at home at any level using one or two dumbbells.Watch: 5-move dumbbell workout that only takes 20 minutesIf you're short on time, you might want to focus on more muscle groups in one session using moves known as compound exercises (ones that work multiple muscles, like push-ups or squats). This means you can train the same muscles several times per week and still hit your workouts two, three, or more times if you wanted to.If I were rushing through my resistance training for the week, I would try this workout, as it only takes 20 minutes, strengthens your whole body and doesn't require a gym membership. If saving money and time is the goal, here's how to achieve it.