Weight training can improve your overall body flexibility.

True.

Explanation:

Flexibility is an important component of fitness and has many positive effects on the body. For example, it improves mobility, posture, muscle coordination and reduces the risk of muscle injury and pain. It even helps in general "form." It mainly increases your range of motion and facilitates the execution of certain exercises. Flexibility can occur not only through stretching, but also through daily exercise and even weight lifting through proper physical training.

b) the heart is a pump made of muscle and that is difficult to grow in the lab.