Boys:
-Deepening in Voice
-Growth Spurts
-Pubic Hair Development
-Increased Production of Testosterone and Sperm Cells
Girls:
-Growth Spurts
-Pubic Hair Development
-Menstrual Cycle Begins
-Increased Production of Estrogen and Eggs
Weight is a very large factor in are day to day lives. People whom are overweight can experience things such as becoming out of breathe from simply walking across the kitchen or tying their shoes, not to mention not staying a healthy weight can lead to many problems such as diabetes, heart failure and much more.
What don't you understand?