Choose one of the stages of development (childhood, adolescence, adult, elderly) and design a program to improve muscular strength and endurance in that group. Include the importance of building muscle as a means of becoming leaner, controlling body weight, and positively impacting metabolism. Choose the progressive resistance technique best suited to the sub-group you are working with. Describe the importance of building muscle as a means of becoming leaner, controlling body weight, and positively impacting metabolism.