Welcome to Pettalk, Mazie. I got a real kick out of imagining your two little furrys all harnessed up to a sled! Sounds like you have a great time with them at the obedience trials -- maybe you can post some pictures sometime, we'd all love to see your pups. As you can see by my logo, I am Mom to three siberians. We lived in the city with our first girl, Star, for 6 years. She busied her days with chasing squirrels in the trees in our yard for hours on end. We played fetch and took lots of walks. Once my kids were gone, we got another dog to keep her company. Huskies really need company. Their pack instinct is really strong and they get very lonely when left alone. We're out of the city now but I take my three almost daily to our local dogpark so they can run their little hearts out (which they do) and my extra-energetic little guy also gets as much fetching as he's willing to do.
One good thing to do is to be sure they "work" for whatever they get. They have to follow a command before they get treats, meals, attention, toys, you get the picture. It helps you keep your place as the head of the pack, which is important with this breed. I'm sure you'll get lots of other info from other husky owners on this site, there's quite a few.