Those are two different things. I'd consider marching in place somewhere between a static hold and a weighted walk. I couldn't really say where in between, but any sort of movement you'd do while holding a weight will require more stabilization than if you just stand or sit in one place.heavy holds or even heavy marching on the spot.
If you march verrrrry slowly so that inertia does not assist in balance, maybe fully weighted on one foot for 2 breaths then switch, you get a significant balance challenge/training effect. I've been doing this for several months holding single kb in rack position and have noticed a marked overall improvement in my balance. It shows up in things like standing on one foot to dry the other one after a shower. The effect was enough to almost be a "WTH effect".I'd consider marching in place somewhere between a static hold and a weighted walk.
Or indeed in any "unusual" environment - my grandfather worked in the pottery industry 1920's to 1960's he once told me that carrying crates of newly made pots (often on the head) made you strong but what really made it work was carrying it carefully so that nothing got broken while navigating around the factory floor.Trying to replicate those movement challenges in the 'fitness world'?
Doing things in the wilderness always reminds me how constrained weight training is.