Final answer:
While each workout does not need to include all major muscle groups, a balanced fitness routine will target all of them over time through a mix of aerobic, anaerobic, and flexibility exercises.
Step-by-step explanation:
Exercise does not necessarily have to include all major muscle groups every time you work out, but a balanced exercise regimen will eventually target all major muscle groups for overall fitness. There are three types of physical exercise: aerobic exercise, anaerobic exercise, and flexibility exercise. Exercises like soccer and rock climbing often encompass more than one type. Anaerobic exercise, which includes activities such as push-ups and sprinting, maximizes muscle contraction strength over short periods and is particularly effective for increasing muscle and bone mass and strength. This form targets fast-twitch muscle fibers, which use less oxygen. However, it's important for overall health to incorporate exercises for aerobic capacity, muscle strength, endurance, and flexibility into your routine to target different muscle systems, including the heart muscle for cardiovascular health.