The Southern Demon, Du Ying, brutally killed six mysterious foreigners in what was a one-sided massacre, demonstrating to the elder the true might of True Qi when transformed from concentrated strength.
Generally speaking, practicing martial arts is meant to strengthen and improve one's physique, enhancing bodily health to achieve immunity from illness and self-protection.
These are the results that can be reached through ordinary martial arts training.
At the next level, when martial arts practice reaches a certain realm, often referred to as martial artists, whether it be boxing or foot techniques, one achieves certain accomplishments and possesses destructive power. This surpasses the ordinary level and reaches an advanced level, making one a foundational figure in the martial arts world.