I grew up knowing that as much exercise you do as much benefit you get!
Last week, I met somebody who is studying Exercising Biology, and she said that if you did exercise to much, you would have more problems when you get older.
I know that in some cases, such as doing hard and extreme extremes such as Gymnasium extremes too much and hard is harmful. Running to fast and too much might cause problems in the knees. Also, exercise hardly with warm up is also harmful. Beside taking some special tablets, I don't know what they are called, for building muscle is also harmful.
But I had never heard that regular exercise even doing them a lot progressively is harmful. What I know is that if you exercise a lot, you will see the benefit when you are older.
I know I wrote a lot, but I am really confused, can you help me?