What is essence of trait theory of personality​

A trait can be thought of as a relatively stable characteristic that causes individuals to behave in certain ways. The trait approach to personality is one of the major theoretical areas in the study of personality. The trait theory suggests that individual personalities are composed of these broad dispositions.

it also supports my hypothesis. if you rest first you can squeeze the clothespin more times. from the data i collected the average of the eight people concluded exercise makes your muscles more fatigued and less able to squeeze the clothespin compared to resting before squeezing.