Elbow injuries suffered by pitchers in Major League Baseball occur frequently and result in tens of millions of dollars in losses each season, representing the money that must be paid in salaries to pitchers who cannot perform due to injury.

To address this issue, three Northeastern University engineering students have developed a data-logging uniform shirt for pitchers that can help prevent elbow injuries while providing an electronic analysis of pitching mechanics.

Via Gizmodo

I've already bought myself one of these  to determine fatigue for those times I'm alone...when I'm working out...Yeah, that's it, working out.