John Mayer gym basketball one on one celebrity fitness trainer

John Mayer gym basketball one on one celebrity fitness trainer

Singer slash songwriter John Mayer has always been somewhat of an athlete!

The "Gravity" singer hung out with his personal fitness trainer in Studio City this afternoon and part of their workout included a friendly game of basketball! That Mayer. Such a playa!

And good to know Jen Aniston's ex is still exercising nonstop - check out those guns!