What physical trait mean?

A physical TRAIT is a characteristic of an individual. For example, a red headed girl who stays out in the sun a lot might develop a physical trait of freckles. And a woman who overeats could well develop obseity as an unfortunate physical trait.

A person who works out regularly at a fitness center would soon have traits of muscular development, ability to lift heavy weights, perhaps learn some athletic skills

he didn't know before, et al.
1. A distinguishing feature, as of a person's character. See Synonyms at quality.

2. A genetically determined characteristic or condition: a recessive trait.

3. a. A stroke with or as if with a pencil.

b. A slight degree or amount, as of a quality; a touch or trace: a sermon with a trait of humor.