> "but hiit also causes a lot of damage in a lot of ways"

Please do explain this.

Technically weight lifting (muscle hypertrophy) also causes "damage" but in a controlled an beneficial way.

knappe an hour ago | parent | next [-]

I really think you're being pedantic to the point of detriment. Runner's knee is a very well known condition in, wait for it, runners!

Seems to me hiit is a way to avoid these overuse injuries.

	▲	andriy_koval an hour ago \| parent [-]
		I think runner knee was a bad example. Sprint running is more sensitive to form in order to avoid injuries, especially in older adults.

tdiff 2 hours ago | parent | prev [-]

I would guess they mean hiit can traumatize e.g. joints or cardiovascular system, especially for the elderly.