Like Snapchat and Twitter, Instagram is an app that allows professional athletes to give fans a candid look into their daily lives.
Unlike Snapchat, the photos don't disappear (unless they're deleted), making the app a fun place to scroll through an athlete's account and see how their life may have changed over the years.
It wasn't so long ago that Aaron Judge was posting goofy shots of his college roommates at Fresno State, for example.
It also may be athlete's favorite place to show off their training routines.
Even in retirement, James Harrison is still posting his jaw-dropping workout routines.
LeBron James' Instagram story is also constantly updated with montages of his training, particularly during the summer months.
Movie buff Kevin Love uses his story to provide updates on whatever flick he happens to be watching at the time, while C.J. Miles often posts photos of his extensive shoe collection to the platform.
But Instagram can sometimes be a little too addicting for certain athletes.
Back when Pablo Sandoval was a highly-paid member of the Boston Red Sox, he was caught liking photos on Instagram during a game.
The violation of team social media rules earned Sandoval a one-game suspension.
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