This really applies to Spider-Man but can lead to other characters as well. I notice due to popular belief Spiderman limit is 10 tons. But to me, when he lifts 10 tons he's at rest. What I mean by rest means that he is not straining to lift it. IE: When you pick up a bottle of drinking water, you are using your rested strength. You can lift that bottle of water as many times as you want without your muscles giving in. In contrast, when you lift up something heavier for example a weightlifting weights, your muscles begin to strain and you can only lift those weights until you can lift it no longer. Spiderman can lift up a bus (7 tons) with relative ease and not strain. He has also shown to lift up heavier objects with ease without strain (Tanks).
So if his rested strength is 10 tons, what would be his straining point?
And after you guess his straining point, what would be his max limit of how much he can lift, pull or push?
Other characters: Rested strength and Max