Even in his most casual moments, Jim Harbaugh cannot help but bring out his competitive spirit.

During a recent trip to Six Flags Discovery Kingdom outside San Francisco, Harbaugh faced off against Siku, a 1,750-pound female Pacific walrus, in a pushup challenge.

Shockingly, Harbaugh isn't wearing khaki pants and a 49ers hat, but everything else about this video aligns with the man we've come to know and love for his boundless intensity on the sidelines and his still-impressive physique.

According to reports, Harbaugh also got a kiss from a sea lion, bottle-fed a tiger and met an elephant.