Z2 sessions are supposed to be boring, they force you to endure the mental pain of not feeling physical pain when doing something dull.
They also train you to listen to your body.
Doing something else while in a Z2 session is going to kill those Z2 gains.
And overall, being bored is great for the mind, help with creativity, problem solving...
Once you embrace Z2 sessions, they became some sort of meditation, with the endorphins helping after a few hours.
Watching a video or typing stuff will remove all those potential benefits!
Sometimes it's nice to not overthink or try to optimize everything. Just enjoy the moment, enjoy the mental pain.
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