I agree whole heartily with this method. More like the way a cage fighter/Wrestler trains versus a boxer routine. Karate etc. fighters found out that their type training was not working very well for cage fighting events. In a all out fight to the finish,a do or die type fight event. Needed training to learn how to recover while in a more anaerobic type state. Since no quarters are given till a certain time bell rings for the next round. Little rest is allowed even then. Similar scenario our dogs go through during a hard pulling event. Lot of hard pushing and shoving.

The only thing IMHO I would suggest. I know most dog men know how to prekeep a dog, before any serious work. Would work up to 30 minute aerobic type work/long walk afterwards, twice a day. A swinging jenny or round table for aerobic training works great for this.

Only feed main feed once a day in PM after work. With added fluids as needed twelve hours before PM. work out.. Have dog wormed, cleaned out and use to it's new feed. Allow foot pads to toughen/ muscles to tone up and dog on best weight with little or no gut fat in dog. Depending on the season and how fat/ lazy or active dog is on the chain. Pre keep could be 4 weeks to 8 weeks. All depends on type dog being worked with. If owner kept dogs in good lean chain shape. Extreme Cold weather areas will dictate how heavy a dog is kept on chain etc. Where one lives/life style/ type of over all weather will always dictate the best type equipment one can use the most. Cheers