The Inverted W
The Inverted W is the term that is used to refer to a family of
problematic pitching arm actions. These arm actions include the...
The Inverted W is primarily responsible for the injury
problems of a large number of pitchers, including...
As I explained several years ago in my
of Mark Prior's pitching mechanics, and more recently in my
analysis of Stephen Strasburg's pitching mechanics, the
Inverted W contributes to injuries in pitchers by creating a
The Inverted W decreases the likelihood that the
pitcher's arm will be in the proper position when their shoulders
start rotating and thus increases the load on the elbow and the
The idea that the Inverted W is problematic is controversial,
and I have addressed some of the objections to the theory in my...
However, in an effort to convince people that the Inverted W is
indeed the problem that I say it is, I am in the process of
putting together an...
...that goes into much more detail about why the Inverted W is
problematic, how to prevent it, and how to fix it. One of the
things that I discuss in that webbook are some of the relevant
If you are interested in helping to fund this project, I have
put together a page for