This is all too complicated for me. When it warms up, I start getting the llamas in shape by hiking the hills with them. I have a couple places near here that are pretty steep. As they start getting toughened up, I put water jugs in their panniers. By camping season, they're carrying 60 to 80lb each.

I also put water jugs in my own pack so I get in shape along with them.
The only calculus or zoology involved is estimating the pannier weight so it's balanced.

“In a time of deceit telling the truth is a revolutionary act.”
― George Orwell

It's not over when you lose. It's over when you quit.