I love/hate farmers walks.
They are absolute torture, pain, agony, misery, basically any negative term you can think of while you are in the act.
But, if you respect the movement and give it your truest due diligence, they will reward you ten-fold in terms of forearm development, strength, conditioning, overall power, and actually a new awareness, perception and acumen in terms of what you as an individual are capable of.
I recently have been playing around with a few variations.
In the past, I would load up what would be nearly the equivalent of my max deadlift and take a torturous stroll.
Recently, I combined that notion, albeit lower loads, and went for a designated time (1 min, 2 min, 3min.)
Just a little hint, about any load carried for 3+ minutes is going to have a metabolic impact.
Going down the rabbit hole further, I tried some other variations.
One that absolutely stood out was farmers walks, with an EZ bar, carried behind the back.
Even with moderate loads, I could sense that this movement was providing excellent returns based upon my efforts.
Traps, shoulder girdle, upper back, arms, virtually every muscle is recruited.
This is full-body conditioning and is easily adapted into any training template.