Hey KG here is how I work it and how I believe you get the best results. Weight pull training is no different than weight lifting for humans as muscle is muscle. What you want to build in your dog is strength, not bulk. The way to do this is to tear the muscle down, it rebuilds itself stronger and bigger too. However you have fast twitch and slow twitch fibers. To do it right, less weight longer distances works best. But mix up some short quick bursts as well, just focus more on long distance drags. You will find you need less weight as you are dragging it further, this builds endurance. When I was training hard we were dragging about 2000 ft. Eventually, instead of going up weight I went to 2500ft then 4000 ft. Basically it was 1000ft to the back of my property line, so 2000 there and back. As we built up I did all the dogs 2000ft then came back and did them again. I never acutally did 4000 at one time. My goal was for the dog to be hot, tired and working hard the last 5-600 feet. I wanted it to be hard but yet not so hard they wanted to quit. NEVER try to max your dog out at home. There is no point, no one keeping track or setting records. Leave your max for the show. At home build the mind and body!