Can someone explain to me cumulative benefits of the following:

Friend and I went for a Saturday walk at a park. We each had a kettle bells and they weighed 35lbs and 55lbs respectively.

The track was 1 mile. The workout was as follows:

Kettle Bell A - 35lb
Kettle Bell B - 55lb

Each person gets a Kettle Bell. Walking at the same time. We went

* 25 steps One hand overhead press holds
* 25 steps one hand rest on shoulder holds
* Switch hands
* 25 steps One hand overhead press holds
* 25 steps one hand rest on shoulder holds

Switch From KB **A** to KB **B** and repeat.

We did this for 0.5 miles or roughly 10 times with each KB. I would consider this Lower intensity, as we weren't running. (Correct me if I'm wrong)

We stopped and did 

* 200 swings 100 with **A** 100 with **B** each.

Walked 100 ft. with Both KBs overhead
Switched Hands
Walked 100 ft. with Both KBs overhead

So I think the above were stabilizing each shoulder because of the different weights..?

Then farmers walk the rest of the mile, minimal to no rest the entire time.

At the end I felt utterly destroyed, and I'm curious was this CNS work? Core is probably an obvious one, shoulders, what else was affected? Is this actual Low Intensity or High Intensity?