Not that he makes it difficult to tell how he's feeling on the course, but a closer look at Tiger Woods' body language has revealed some interesting insights into the 37-year-old's game.

The Wall Street Journal set out to study Woods' golf course gestures and what they mean for his play. More than 220 shots from six tournaments were classified as "good" (down the fairway or near the pin), "OK" (in the first cut or on the green but not close to the hole) and "bad" (in the trees, bunkers, etc.).

With Woods competing in this weekend's PGA Championship and vying for his first major title since 2008, this primer should give fans a clue into Woods' thinking.

Below are some of the findings. For the entire study, see here.