It is full of fads and trends.
Some good and some not ideal.
Anything that I see the name high-intensity, I say that it is no good.
So the best high-intensity training is the one that you avoid.
Do exercise with pleasure, love and respect.
Find something that you can do for years without end.
Then that's the right intensity.
For more tips, read my books available on this website.
The fitness industry is like the fashion industry.