Seven out of 10 American adults don't exercise regularly despite the proven health benefits, a study released Sunday says - Study: Most Americans don't exercise regularly. That sounds about right.
When the body is exposed to more of a stimulus that it is equipped to handle the body will makes a positive adaptation as a form of self-protection. That change will occur if the body has the capacity to change plus the needed time and resources to recover. The changes will continue to occur if the body is faced with new challenges.