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• Batters rarely add power once in the majors and start declining due to better early-career training.
Position players are not becoming stronger in their late 20s, as conventional wisdom suggests. Bat speed and exit velocity are not immune to aging like so many other movement- and speed-based skills in the sport (like pitching velocity).
When players arrive in the major leagues, many of their underlying skills are nearly as good as they will ever be – at least since we’ve had the ability to measure them in the Statcast era.
Driveline director of hitting Tanner Stokey noted that those skills’ aging curves might have been different years ago – perhaps more players did grow into strength and bat speed – but it is a different game in the modern era.
“You just assume players are the most physically gifted they’ve been – they have all the resources in the weight room, the nutrition side, the sleep, recovery side, right? It’s very different than it was back in the day,” Stokey noted. “That stuff is pretty optimized compared to where it was 20, 30, 40 years ago.
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