In this video Dan John lists loaded carries as a basic movement pattern (along with push, pull, hinge and squat). He further goes on to say that loaded carries (e.g. farmers walk) is the one movement that has the biggest impact on athletes (also keep in mind that DJ was a competetive shotputter = rotational athlete when he discovered the benefits of loaded carries on himself). This seems to indicate that loaded carries train muscles that are not being trained by the other compund movements.
Which muscles is that? In other words which muscles do loaded carries train that are not trained by say the deadlift, the squat, the benchpress and pullups.
I already know that it trains the Quadratus Lumborum, and this is very good in order to avoid pain in the lower back.
From what I read it also trains the Gluteus Medius: (1) Is this correct? Do it also train the other internal hip rotators? The glute medius is part of the internal hip rotators that are important during athletic activities such as running, boxing and throwing. That would be a great way to avoid "silly" exercises like this:
From what I read it also trains the rotator cuff: (2).
If so this would be a great way to avoid another "silly" exercise: