When we want to see whether someone is strong, we often look at the size of their muscles. Someone who has large, bulging muscles must be able to lift a lot. However, the truth is more nuanced than that. Not only the quantity of your muscles is important, but also the muscle quality.
Two people whose muscles are equally big may therefore have different levels of strength. Even within one person there can be differences. The left leg can for example be stronger than the right one. It is important to be aware of this, as that can lead to injury.