There are various huskies (e.g Siberians, Greenland dog, malamutes, samoyds are sled dogs but are generally considered to be spitz rather than husky type) and they vary a bit in behaviour and how they look e.g siberian huskies are leggier and lighter than Malamutes and are considered sprinters and they are generally less confrontational with other dogs. Malamutes can used for weight pulling with less speed and some breeders advise against ever letting mature males off lead, unless in a secure area away from other dogs, as they can be aggressive to other dogs once mature (although no doubt there are some exceptions).
All huskies typically tend to be quite assertive, strong-willed dogs and they are termed "northern" dogs who are considered to be closer than some other dog types to wolf looks and behaviour e.g howling, denning i.e digging, including into furniture and gardens and testing boundaries.
In terms of exercise remember that when fit they are breed to run up to 20 miles plus a day, pulling weight.