Really interesting read!
Noel Dickover

Great question — probably a blog post in itself :)

Short answer — heavy cardio workouts are like heavy workouts on your muscles. They hurt the muscles short term (heart muscle) but builds it up over the long term.

However — too much is not good! For most people.

We’re talking marathons, iron-man triathlon, chronic cardio.

Mark Sisson covers this in great detail:

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