Which of the following BEST explains why multiple exercises are needed to improve muscular strength and endurance throughout the body?
A. Push-ups don't exercise leg muscle groups.
B. Different exercises are needed to improve different muscle groups.
C. Weight lifting is more important for muscle strength than endurance.
D. Not all muscle groups can be exercised simultaneously.

The affordable care act has expanded mental health and substance abuse benefits to 62 million people and is an addition to the mental health parity act of 2008. the changes and additions require mental health coverage in small group and individual plans where people were not previously covered. what is the biggest benefit of these changes? what major challenges are still associated with mental health coverage? explain your reasoning.