The goal of this research was to see if there was any correlation between the time of day and a person's flexibility. The students hypothesized that a person would be more flexible toward the end of the day than at the beginning of the day. Subjects had to do a sit and reach test and one part of the Berg Balance test, the reaching forward with outstretched arms test. The subjects performed these tests three times a day on four different occasions. The measurements show a general increase in flexibility throughout the day with the highest flexibility being in the evening hours. This knowledge could help people decide to schedule more intense workouts during a time of day when injury is less likely.
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Drollinger, Hailey M.; Rinkenberger, Gaige J.; and Woller, Nolan J., "Flexibility" (2017). Kinesiology 288. 5.