Karate is a sport, but it's still martial arts
I was recently browsing Youtube watching World Championship Karate sparring championship fights - Kumite (Japanese: 組手, literally "grappling hands") - as my daughter is competing in this sport.
On one match there were a bunch of bro-comments dissing the karate fighters. The consensus was that karate fighters wouldn't stand a chance in a real street fight as it was all theatre.
There's a grain of truth in those comments. Martial arts were about defending yourself and disabling your attackers.
If there were multiple attackers, then your survival demanded that you inflict as much damage as possible on them to bring the odds back to your favour.
An under-appreciate benefit of HIIT exercise
Arterial stiffness occurs as a consequence of biological aging and arteriosclerosis. What is often not well appreciated is that exercise can make a significant contribution to reducing arterial stiffness, and thus mitigating the adverse health consequences.
How does that work?
Exercising makes the heart work harder and this sends more frequent pulses of blood out into the arterial system. These "pulses" are not just pushed along by the force of the heart, as in a pump pushing water through a hose. The blood is pumped along by the muscles in the arteries contracting and squeezing like squeezing toothpaste.
This exercises the arterial and vascular muscles! The exercise reduces their "stiffness', just like other muscles.
And in addition, as you exercise your heart it becomes stronger and able to pump out bigger pulses of blood with each stroke. That's why your resting heart rate drops as you get fitter. These bigger pulses make the arterial and vascular muscles work even harder to push the bigger pulses of blood along, and they get even less stiff.
Since I was diagnosed at 50 with Type 2 diabetes I've been learning how to do bone-building fitness training which lowers my age. You can too. It's your choice. Walter