Individuals should participate in Aerobic exercises to increase cardiovascular endurance. (There's more exercises than just running that can increase your cardiovascular endurance, aerobic is more of a group of activities that do such)
You should measure you level of flexibility in order to know you limits in terms of stretching your body and immersing yourself to different sports that require more physical effort. Flexibility here refers to the absolute range of movement your joints and muscles will come across. You will be in motion.
Answer:
Heredity influences several factors that contribute to fitness, such as body size and muscle fiber composition. Whether we are tall or short is determined by heredity. The percentage of slow-twitch and fast-twitch muscle fibers found in skeletal muscle is determined genetically.