As strength Coach, CJ Murphy said in an interview with Elite Fitness Systems, the farmer's walk builds "cartoonish strength"
The farmer's walk is an exercise that is easy to learn, and gets you strong fast. It works the grip, forearms, traps, shoulders, and the entire upper back. Not to mention, it works on ankle and hip mobility. But, you have to work hard and be extremely focused the entire time. The second you lose focus and your grip slips, the exercise is over. The carryover from the farmer's walk to sports is tremendous.