Both the owner and veterinarian should be particularly sensitive to the performance dog's weight. What is a good healthy weight for a pet dog with normal activity expectations may be too heavy for training and competition. In addition, you should be able to pinch only a small amount of skin on your dog's back over her rib cage. Many trainers and competitors recommend working with your dog between practices specifically on conditioning, some good ideas include water retrieves, jogging, bicycling or just playing a game of Frisbee or catch in the yard. It is important to get your dog above a walking pace when conditioning.
Some people find doing some sprinting is also beneficial.