Evolution and Fitness
The process of becoming fit is conceptually simple and applies to everybody. It spans the spectrum of people, from the sick and frail to professional athletes. Age and/or condition are irrelevant because the process is individualized. It is simply an evolutionary process which takes place in the presence of a challenge that our bodies are not currently capable of handling. When faced with this challenge, multiple times our bodies evolve, develop muscle, lose fat, increase cardiovascular capabilities, whatever is needed. So if you want an effective workout, no matter your age or you fitness level, start trying to do something you can’t do.