He said it involves more core and lower-body work.
"The shoulder takes the brunt of the throw if you don't have your core and your legs into your delivery," Phillies pitching coach Rich Dubee explained Sunday morning at Marlins Park. "It becomes more arm."
It is strange to hear Halladay, 34, talk about any deficiencies anywhere, because he is one of the hardest working players on the team. His early-morning arrivals at Spring Training are legendary, and he is always seen working himself into a lather running up stairs and around ballparks in the days following his starts during the season.
"There are times in your life you've got to change your program and do things differently," Dubee said.
"Unfortunately, you kind of get a little stale with it. You kind of just stay at the same level. Again, playing as you get older takes different stuff."
Dubee added this about Halladay's potential to bounce back next season: "I'm fine with Doc. I'm fine. Who wouldn't be?"