Jim Harbaugh throws down a pushup challenge to a ... walrus

Jim Harbaugh doesn't mess around.

The 49ers head coach took a trip to Six Flags Discovery Kingdom in Vallejo, Calif. over the weekend and came across Siku the Walrus. Well, it should make perfect sense that a competitor like Harbaugh would get down and challenge the giant sea mammal to a pushup contest.

Check it out below:

By the way, does anyone else find it weird that Harbaugh isn't wearing tan khakis and that black 49ers sweatshirt? He actually looks ... casual! Good times, good times.