Final answer:
Demonstrating competency in fitness activities involves understanding and performing exercises that target different health goals. (a) Weightlifting builds muscle strength, (b) yoga improves flexibility, and (c) aerobics enhance cardiovascular health. These activities contribute to preventing lifestyle diseases and improving the nation's overall health.
Step-by-step explanation:
To demonstrate competency in fitness and wellness activities such as weightlifting, yoga, and aerobics, one must showcase proficiency in the specific skills and benefits associated with each activity. Weightlifting is primarily an anaerobic exercise which builds muscle strength and improves bone strength, balance, and coordination. Yoga is known for its flexibility exercises that help increase the range of motion of muscles and joints, reducing the risk of injuries. Aerobic exercises, including activities like cycling and running, focus on improving cardiovascular health and muscular endurance.
Lifestyle diseases such as obesity and type 2 diabetes can be prevented through regular physical activity. Muscular strength refers to the maximum force a muscle can exert in a single effort, whereas muscular endurance is the ability of a muscle to sustain repeated contractions over time. Aerobic exercise provides several health benefits, including enhancing heart health, increasing stamina, and assisting with weight management. Muscle injuries, including strains and sprains, can occur during physical activity but can often be prevented with proper warm-up and cool-down exercises including stretching.
According to the 2018 Physical Activity Guidelines, people engage in moderate to vigorous exercise to reap various health benefits. However, many fall short of meeting these guidelines, which impacts the nation's health and weight. Therefore, incorporating a combination of anaerobic and aerobic exercises, along with flexibility training, is crucial for overall health and well-being.