But there can also be differences in distribution from person to person. For example, your biceps might be strong but you always struggle with tricep extensions.

“A lot of it comes down to genetic make-up,” says Martena David, personal trainer at Gymbox. “We will all have muscles that tend to be easier to activate than others, and because of that we’ll probably feel a lot stronger in some areas, be able to lift heavier in those areas and put those muscles under more stress so they break down and rebuild faster.”

But our lifestyles can also make a difference. “The way most of us live now is quite sedentary, with a lot of sitting down. That tends to result in things like tight hip flexors or underused glutes,” she says. And depending on your preferred type of training, you might naturally be building more dominant muscles – whether you intend to or not. For example, runners tend to be more quad dominant, while regular spinners will have powerful hamstrings.

Muscle imbalance: why are some muscles so much stronger than others?