Two people with different body sizes want to compare their strength levels when lifting the same object. for a fair comparison, what should they measure?

Two people with different body sizes want to compare their strength levels when lifting the same object. For a fair comparison, what should they measure? 
I believe the correct answer for this question is who can lift the longest :)
If you need more additional help, please feel free to leave me a comment below :) 

People need to distract themselves with actitives. they can also find a natural high. an example would be eating alot of meat. that meat can release dopamine to the brain which gives one a natural high feeling.

Nail fungus, which can cause the nails to crack, peel and change color and texture.