Balans Bag™ is a modern and improved weight bag with handles. Bulgarian bag and sand bag/power bag are training bags filled with sand. Instead of a permanent filling, it is filled with ordinary water, the level of which, and thus the weight of the bag, can be freely adjusted. Due to the reinforced external sheathing, the weight of the bag can be adjusted from 1 to even 19 kg, without the risk of its tearing. Constantly unstable fluid turns the simplest exercises into challenges, which require a lot of precision and body coordination from the user. Exercises with the use of Balans Bag™ stimulate deep muscle fibres and will be suitable during functional training, personal training, as well as during group exercises. Due to the simple method of weight adjustment, it can be also used at home, outdoors and it is very travel-friendly. A set of ergonomically adjusted grips makes the water bag Balans Bag™ a perfect tool for working on the stabilisation of the thorax, endurance and strength. It is an indispensable device in the scope of strengthening the muscles and mobility of joints, as well as increasing the rotational capabilities of the spine.