CC Sabathia’s trainer Dave Paladino posted Instagram videos of his workouts in an empty gym showing the process behind a photo of a slimmed-down and buff Sabathia going viral.

The retired Yankees southpaw looks like a different person, having dropped significant weight and adding muscle. At one point in his career, the 39-year-old weighed close to 300 pounds and battled a recurring knee injury.

But without baseball to worry about, Sabathia is working on his body, and so far the results are obvious.