You should look into buying or building a sled.
If you and your friend have a good deal of disposable income, then Id say, go to eliteFTS and spend it on a prowler.
I guarantee you, if you think you are in shape, 20 minutes with the prowler will make you think otherwise.
Even without the prowler, a regular sled will kick your ass.
Call some tire places and see if you can snag a 300-600 lbs tractor tire for free or cheap. Flipping tires is pretty fun, and is almost as brutal of an ass kicking as pulling a sled.[/quote]
AGREED!! the prowler is a beast, absolutey kicks ur ass and will bring you down a couple notches…also tire flipping is a GREAT workout…will hit muscles you never thought you could get sore! i love tire flipping…if you can get a few, my freinds and i start with a 550lb tire flip it for 15 yeards…drop to a 350lb tires flip it for 15…and drop to a 250lbs tire and flip that for 15 yards…its a bitch of workout…we dont do it often but when we can it will leave you with zero energy left…great feeling