A device (1) for improving an individuals physical performance and ability to maintain balance, which is suitable for being placed close to a portion of the individuals skin, comprises at least one metal body (2, 2′) which is provided with a first metal layer (4, 4′), and at least one second metal layer (5, 7) that is based on a metal selected from ruthenium, rhodium and platinum and is at least partially superimposed on the first layer (4, 4′).
