This biosensor tattoo is a technology designed to help athletes and soldiers from over-exerting themselves. The sticky sensor is adhered to the skin during a workout and monitors stamina throughout to determine the point at which a person can't physically work out any more.
This technology is able to detect the point at which an athlete will "hit the wall" by measuring the levels of lactate produced in sweat. At a specific threshold, a certain level of lactate production indicates that the body is near fatigue and can't push any harder.
Currently, lactate-measuring methods are long processes that require drawing blood samples. This non-invasive technology will be useful for informing athletes of their thresholds instantaneously to help to maintain a healthy workout regime without completely exhausting themselves in the process.