This is performance art, right?

Hahahahaha. I may know nothing about sports, but I know that the Mannings are doofy. I don't know what the sports term for it, but they're big, lumbering, goofy dorks who win a lot of games. I forget which one is the doofiest (I think it's Eli), but even I know that this is classic Manning lameness. Apparently, there's a rational (albeit really dorky) explanation for this, which the Denver Broncos (ohhhhh, he's that Manning) offered on their website:

Sources: Scott Wise on Twitter | Denver Broncos