hen just liurn ie they're ready to start. >> reporter: they are four legged athletes, alaskan and siberian huskies bred for whatever awaiting them along the beargrease. and every single one of their human companions took different paths in life before they ended up on this one. >> my parents have been doing it since i grew up, i grew up around the sport so here i am doing it now. wallin is one of the youngest in the marathon, even competing against his mom's team. >> it is pretty exciting. everything is coming together. this is what we all wait for, train for and get excited for the whle year and now it's here. >> reporter: dry land training takes place year round, even in alaska. they pull me on a four wheeler. ryan and his team made the 72 hour drive from the land of the midnight sun to minnesota. he is a former beargrease champion. >> it is a really tough race, with the hills and the competition is very good. goodpeople in minnesota areawyeg