Flyball is a somewhat new activity that was created to serve as the first team based sport for dogs. Teams of dogs are prompted to run over a course of hurdles in order to obtain a ball and then bring it back so that the next team member can do the same. It's a lot of fun to watch and a dog like an Alaskan Shepherd would likely take to it quite well.
For dog owners looking to take out two birds with one stone, consider trying active fetch. This activity is essentially the same as a classic game of fetch, but it prompts you to get active by doing push ups, sit ups, jumping jacks and other types of activities while your dog chases after the item you've asked them to fetch.