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.

1. body tissue that is connected to and moves the bones in the body hypertrophy 2. the ability of a muscle to move a weight repeatedly, or for an extended period of time tendon 3. the increase in the size of a muscle fiber in response to resistance training muscle strength 4. the most amount of weight a muscle can move at a single time skeletal muscles 5. the decrease in the size and strength of a skeletal muscle when it is not used atrophy 6. strong body tissue that connects the muscles to the bones muscle endurance