20 POINTS!! pls ASAP
Select all that apply.

How does a "well-rounded" exercise program seek to improve overall fitness?

1. by training a person to be an Olympic marathon runner
2. by improving cardiorespiratory fitness
3 .by increasing muscular strength and endurance
4. by increasing levels of flexibility
5. by allowing a change in body type from endomorph to ectomorph
6. by improving the body's proportion of lean mass to fat