He is trained on weight dragging he has very good endurance and strength. The highest he ever went was a car tire with a 10 pound chain for a couple hundred yards. I need to get chain because it is easier to measure the weight and more stable than a tired or dumb bells. He just got a pro WP harness so I think this will help him with his form. This is him right now he hasnt worked out in a month he is at 78 pounds: