A Pit Bull without a job to do may become destructive or act out against other dogs or people. Pit Bulls feel the drive to be helpful, and if they are not given something useful to do they may make up their own job, which is not likely a job you are going to like. The powerful jaws and muscular neck of a Pit Bull can make quick work of your couch or even your door. A Pit Bull who learns her job is to be strong and reliable for you when she is out pulling will be happy to nap on your sofa between work sessions.
While Pit Bull compete in power pull events in which they dislodge and pull hundreds of pounds, this is a professional canine athletic activity that only very experienced trainers and dogs should undertake. Start slowly with light weights and short sessions until your dog builds strength. If your Pit Bull is under two years of age, don't build up weight until bones and muscles are fully developed. Even puppies can pull light weights and carts, but never cause young dogs to strain into pulling.
Pit Bulls are prone to overheating due to their short nose, so be careful that your sessions are short and your dog can drink plenty of water, especially if your dog has an especially squat face.