Why are some people naturally more flexible than others?
Quick Answer
Flexibility varies mainly because of differences in joint shape, ligament tightness, and the makeup of connective tissue such as collagen. Some people are also genetically predisposed to looser connective tissue, which can increase range of motion.
The Full Story
A person’s flexibility is strongly influenced by the structure of their joints and the properties of their ligaments, tendons, and muscles. Collagen, the main structural protein in connective tissue, can vary in how stiff or elastic it is from person to person. Genetics matters too: some people inherit looser connective tissue, and certain medical conditions such as Ehlers-Danlos syndromes can make joints unusually hypermobile. Age, sex, training, and previous injuries also affect flexibility over time. That is why a gymnast and a weightlifter may have very different ranges of motion even if they are similarly healthy.
Key Facts
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