Ask any serious bodybuilder; free weights are hands-down the best tools for increasing your strength and muscle mass. They open up a huge range of exercises and, as opposed to machines, and engage a lot of additional muscle groups to keep the balance.Each muscle group requires a different weight, and with your Ativafit? dumbbell, you can select just the right amount in seconds. You can literally put progress on speed dial. Simply twist the secure lock-in dials and select the desired weight within seconds. Any remaining weights will be left in the base plate.At a maximum of 40kg this is one of the heaviest quick adjust dumbbells available. Giving you the versatility of a massive 12 sets of standard dumbbells, your Ativafit? set saves you a huge amount on the initial outlay cost as well as being much more compact to store!With superior design and build quality, it should come as no surprise that Ativafit? are leaders in the U.S. market. While other adjustable dumbbell models have a plastic locking system, Ativafit? utilises a secure high-tensile steel design. Comfortable and secure grip control is provided by the contoured soft grip handle design. Make the home of fitness yours today!