My Siberians love to run, if you have a long leash or a fenced yard running, jogging, hiking, pretty much anything that gets them to burn off some of that energy... Typically not a "fetch" breed, as they are not retrievers...Some other "games" my Sibes enjoy would be digging for "treasure" is another really fun thing, bury treats and let them dig them up and "wrestling" play like a dog! And NEVER let your Siberian just roam loose like was suggested by another member. As your Siberian gets older you should look into Bikejoring and(or) Skijoring if you live in an area that has snow...You can start to train to harness now, as long as you don't apply any load to the harness.
4 Siberians 2 Malamute Mixes