Waterpolo players train endurance and leg power with different exercises. One of these exercises is to train in the water with added weight.
The same weighted belts that are used during scuba dives are used in waterpolo trainings too. This belt does not fit well to the body and movements. The belt moves while you are using, causing constant variations of the center of gravity which complicate and limit movement. Besides the weight is in direct contact with the skin, and it is a rough surface causing small bruises and scratches because the rubbing.
The new system of weights is placed in the posterior lumbar area, so that the weigh does not fall on a single point and thus avoid muscle strain, and thanks to its ergonomic design, fits all type of bodies, is comfortable and without impeding movements allows to train without damage to the user.
https://launchbox.cutandpaste.com/projects/5390d4fc69702d2ee18f0100