1. Physical development in early adulthood

By the time we reach early adulthood (20 to early 40s), our physical maturation is complete, although our height and weight may increase slightly. In young adulthood, our physical abilities are at their peak, including muscle strength, reaction time, sensory abilities, and cardiac functioning. Most professional athletes are at the top of their game during this stage. Many women have children in the young adulthood years, so they may see additional weight gain and breast changes. Individuals become more aware of the need to maintain health through exercise, nutrition, and lifestyle choices. Physical changes such as metabolism slowing and minor declines in sensory abilities may begin but are generally minimal at this stage.

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