The type of work your old Allis, and the F20s and JD “A”s did, included disking and harrowing the moldboard plowing (especially brutal on gently rolling clay hills). Turning them in soft soil conditions is a good upper body workout as well.
Reaching back to trip the lever to mechanically raise the implement also added to the workout.
In my neighboring county of Lawrence,TN, there is quite a presence of Amish. Old school. Two hands on the plow, and draft horse reigns around the farmers neck. The women and children work hard too. I can’t recall seeing one Amish down here that I would consider over weight.
These days I use it to grade the 2-mile driveway after we put down fresh gravel and oil...and that’s about it, LOL!
I used it to haul 800 gallons of water out to new plantings a few years back when it was 104 degrees on the 4th of July and we had planted 400 Norway Spruce seedlings earlier that Spring.
Now THAT was a LOT of work! 200 of the 400 survived in a total drought season for us, so it was worth the effort; we could’ve easily lost them all! :)