While other players are busy getting as swole as possible by doing pull-ups or running sprints at their local gym, MLB's smiliest player Francisco Lindor has traveled across the world to Japan for his offseason training. He is practicing the martial art of Aikido, and he says he is very much "ready to do some work on people."
While yes, Aikido can be used for self-defense, it focuses more on "motion and the dynamics of movement." You know, so Lindor can do some more of this:
It also builds spiritual enlightment, physical health and peace of mind. Just call him Sensei Lindor.