This innovation proposes the use of light materials with high elastic moduli as opposed to the use of weights in weight vests. The elastic vest lets you work out by resisting your motion such that you have to stretch them when you move. This will produce an effect that is comparable to weight lifting. These vests will be easier to carry around since they have less weight and take up less space than weights that produce similar effects. The distribution of elastic materials on the vest is done so that the strings relevant to building a particular muscle are unstretched when the muscle is relaxed. When the muscle contracts, the elastic material stretches to counter its effect, thereby working out the muscle. The resistance that a string provides can be regulated by adding buttons that limit the stretchable length of the string to produce the effects of varying weights. The vest could have different models that are made to exercise different muscles or as a single vest that can work out many all major muscles at once but can have some of the strings deactivated to focus on building specific muscles. Some form of mechanical calibrations can help you count the number of times you stretched each string. This can be modified with a little automation to show you how much work has been done in total or on each string from mobile devices.