Get an old snow sled or a used tire that a tire shop is gonna throw away. Look for some 1" manila rope on ebay. Buy some sand at the hardware store and put it into sandbags. Put sandbags on sled/tire and get in the best shape ever. You will get in great shape and build muscle as you're not doing a lot of running but just hard ass work.
[ame=http://www.youtube.com/watch?v=MtO-DY7MpZQ&feature=related]Now this is Conditioning - YouTube[/ame]
[ame=http://www.youtube.com/watch?v=MtO-DY7MpZQ&feature=related]Now this is Conditioning - YouTube[/ame]