The heart of the runner is a superior and more efficient organ. – Cardiologist Dr. J. Wolffee, MD

The theory revolves around the lung-heart system and leg muscles based on training effects and the study of body adaptation to be fitter every day.

The positive training effects of running by Hans & Ron:

Leg muscles become stronger as;

  • Running increases energy cells known as mitochondria
  • Running increases muscle fibres size and numbers
  • Running increases capillaries numbers and blood flow through them
  • Running increases ATP and glycogen stock
  • Running increases enzymes activities by improving the breakdown of glycogen and fatty acids.

Training improves speed and endurance by modifying FT (fast-twitch) muscles to ST (slow-twitch) muscles, achieved through consistency in a run. As we experience training damages some muscles; as a result, we get stress and pain, but muscles recover in time with consistent training providing enough recovery in mid, will strengthen muscles and build performance.


  • Running increases the number of heart muscle fibres
  • Running increases the number of capillaries and the blood flow through capillaries especially in heart chambers

A regular runner at training uses twice the HR (heart-rate) volume compared to a normal person, which creates a large capacity in the lung-heart system, resulting in lower HR at rest than a pen sports person.