Respuesta :
The problem discussed in the paragraph is self motivation. How the more you excerise the more motivated you become.
The answer is A: New runners sometimes lack the motivation to run.
When someone wants to starr a new project of any nature, sometimes they experience a lack of motivation. So it is with runners also, and some need an extra push to get started. The passage presents some suggestionsfor motivation, like showing clothes and pictures so they can compare. It says motivation will grow as they exercice. Finally, it attests that positive results obtained are valid reasons to set a time for exercising.