Brent Yarina, Senior Editor, March 2, 2016

When he isn't climbing trees on the recruiting trail, sitting ringside at WWE Monday Night Raw or holding spring practice in Florida, Jim Harbaugh is coaching in MLB spring training games.

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The Big Ten's unofficial busiest coach served as the first base coach for the Detroit Tigers in their game vs. the Pittsburgh Pirates on Wednesday afternoon.

Harbaugh, of course, donned No. 4, the same number he wore at Michigan and in the NFL.

This isn't completely new for Harbaugh, who did the same for the Oakland A's last spring.

Any guesses on what Harbaugh will do next?