There are precious few routes in Berlin, but we are actually close to another country, so why not run to it? Rather than specify a single route, here's the challenge: Get to Poland the fastest. Standard FKT rules apply, except you can take whatever route you like so long as you start at the Brandenburger Tor and end on the Oderbrücke Hohenwutzen.
The attached GPX file is apparently the most direct runnable route, but your mileage may vary (literally).
Comments
I realize I made a really silly error in the intro text for this. It shouldn't say "take whatever route you like so long as you start at the Brandenburger Tor and end on the Oderbrücke Hohenwutzen" - it should say "take whatever route you like so long as you start at the Brandenburger Tor and end IN POLAND"
I did email the mods about this mistake but I'm guessing they are a little busy :D