
Originally Posted by
mike_h
Body weight isn't normally incorporated into the measurements of the weights you lift.
It's true squatting with 20lb of dumbells will be easier if your upper body becomes lighter over time, but I wouldn't bother trying to account for that. It's more about how you're able to affect objects and things in the world outside your body.
I'd also recommend free weights (dumbells, barbells, kettlebells) over machines. Your balance and smaller supporting muscles will improve, muscle imbalances are less likely and it'll take care of the metrics issue too.
You are correct that you cannot compare weights across machines/excercises. When the biomechanics change the weights are not comparable.
As you're relatively untrained you should be able to increase strength as you lose weight.