Miller was at 215 pounds last season, when he went 10-9 with the Cardinals. Dealt to the Braves in the offseason for Jason Heyward, Miller has bulked up.
"I feel stronger ... more poise," he told MLB.com's Kevin McAlpin.
Miller has a 6.14 ERA in three games this spring.
"I feel good," Miller said after the start, per MLB.com. "My stuff still needs to get there -- it's not as sharp as it can be, but at the same time, my arm feels good. I've got a good idea of what we need to do going forward."
Miller allowed five earned runs in 3 1/3 innings over his first two spring starts before bouncing back Tuesday. He's set to open his first season in Atlanta after posting a 3.33 ERA and 312:134 K:BB ratio in 370 innings with the Cardinals in his first three seasons.
After surrendering four runs in a third of an inning in his spring debut,
"You always want to do better than the last time out. It wouldn't have been too much harder to beat. It was a pretty rough outing," Miller said after the outing, per MLB.com. "Today was just more trying to learn from last time and just getting more feel for the [strike] zone, which I felt like we did a good job of."
Miller added that he wasn't working on anything in particular in Thursday's outing. He needed 47 pitches to complete his three innings of work.
"Am I frustrated by it? Yeah. But at the same time, it's still the first game of spring training," Miller said.
He also noted he has a lot of time to fine-tune his pitches before the regular season begins.
"It's still early," Miller said. "I've still got a lot of time to work on things. But other than the fact that I made some bad pitches and left the ball in the middle [of the plate], my arm felt good and physically I felt good. That's about all that matters, right now."
Miller, however, was able to finish the season on a high note, going 2-0 with a 2.08 ERA and .190 opponents' batting average over his final seven starts. Miller attributes his success down the stretch to incorporating a sinker into his repertoire, per FOX Sports South.
"I said I'm going to throw some of these, and we'll see where it's at," Miller said of a conversation he had with catcher A.J. Pierzynski before an Aug. 23 start against the Phillies. "It felt good so we just went with it. I started throwing it literally within three days. It's a good pitch that I picked up quick.
"I still need a lot of work with it. I need a lot of work with all my pitches. There's all sorts of ways to get better. But I think that's definitely a pitch that will help me be more efficient and take me deeper into games. That's [the sinker] going to be a huge pitch for me this year that's ultimately going to take me to the next level. Not only that but kind of mixing it all together, becoming more of a complete pitcher more than a thrower."
Miller added he will also begin to work more on his changeup, which he threw just 2.2 percent of the time in 2014, per FanGraphs.com.
"I know [Braves pitching coach] Roger [McDowell] has been known for changeups," Miller said. "A lot of great pitchers have come through this organization, [and] that's a pitch I would love to pick up. I want to be able to throw it more consistently, [and] have a little bit more confidence in it."
|CBSSports.com Player Ranking|
|10/7/2014 vs L.A. Dodgers|
|vs L.A. Dodgers||6.0||0||1||9.00||0||4||4|
|Last 7 Games|
|Complete Game Log|
| 5 || 6 |
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| 12 |
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|More Pitching Stats|
|Postseason Pitching Stats|
|Minor League Pitching Stats|
|2010||AFX-Quad Cities River Ba||7||5||3.63||24||24||0||0||0||104.0||97||51||42||7||3||33||140|
|2011||AFA-Palm Beach Cardinals||2||3||2.89||9||9||0||0||0||53.0||40||20||17||2||1||20||81|
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