I might try that. I was thinking after going frrom 2 t50s o 1, that I needed to go up. Or ren a preexhaustion with 2.
I have no idea what any of this means!
My advice on the unilateral farmer's walk is basically to remember why you are doing it. If it's about core strength and posture, then you want to get stronger holding a weight in an off-center position while staying in proper, upright posture. So you want a weight that is challenging enough that it's hard to stay in that posture for long, but not so tough that you have to tilt over heavily to one side, or causes you to hitch up the weight or rest it against your leg in such a way as to take the load off.
If it's about grip strength and legs and all of that, some of that goes out the window, as it's less important to maintain that posture, IMO.
I wouldn't get too concerned about feeling the activation, though. It's sufficient that the weight you can hold in that position improves, or the time improves, or the distance improves.
Not trying to be argumentative, but thinking out loud. Think there is still a fair amount of assymetric core tightening created by walking (which leg is planted, which is moving) that creates an assmmettry during the motion. IOW resistance of torsion during linear movement forward.
You're overthinking it, here - if walking results in a "fair amount" of asymmetric core tightening, than any and all exercises (including just walking, period) is an asymmetric exercise. But that changes nothing - the point of unilateral loading is to accentuate that asymmetric loading and force additional adaptation.