2 good articles on Washington Nationals outfielder Jayson Werth.
https://www.washingtonpost.com/news/nationals-journal/wp/2015/12/15/can-jayson-werth-still-play-every-day/
http://www.federalbaseball.com/2016/1/29/10868704/can-jayson-werth-still-play-every-day-in-washington-nationals-outfield