The power block sport 5 0 series dumbbells are the perfect choice for the home fitness enthusiast and for personal trainers needing to carry dumbbell weights between clients if your goal is to gain strength develop power reshape your body or prevent injuries by strengthening the stabilising muscles around your joints free weight training will be your most effective workout key features of the power block sport 5 0 equalsreplaces 10 pairs of dumbbells of free weights the weight range for