There were a number of explanations for what went wrong for Roy Halladay in 2012. The most mentioned:
He had shoulder tightness.
He strained a muscle in his upper back.
These factors led to an inability to locate pitches with his usual precision, as well as a drop in velocity and movement on those pitches.
After a wintertime conditioning program tailored to the physical needs of a workhorse pitcher in his mid-30s, Halladay believes he's in position to have a rebound season in 2013.