When you don't exercise your weight might increase, the extra weight might add a lot more pressure to your knees etc. This might cause aches, you also start to look fuller, and you lose/lack energy, when your muscles aren't used the tend to get weaker e.g. Your heart muscles, lungs... Simple running exercises will help strengthen these muscles. by a 11 year old girl
Not exercising, is not good!!!, weight increase, high blood pressure, loss of energy, more pressure on your body to complete day to day tasks, out of breath quicker, feel constantly tired, you could become obese if your not eating properly aswell as not exercising, which can cause coronary heart disease.
Gaining weight, feeling tired, out of breath to name a few. But under each title, there are sub categories. For example, gaining weight adds more pressure on your knees and or back, which can cause aches. You also need to consider high blood pressure.
You get fat and the fatter you'll get!
You gon get fat and you gon stank and smell like spit like a fat person and you gon get athritis too and if you don't want this to happen go run you ass around the block.