A lot of "mainstream" fitness beliefs are not based on evidence or science or good practice
Rather, gym chains and supplement companies promote LOTS of BS as being "scientific", when in reality its simply to sell products and services
Example
The idea of a "1 hour workout"
This is one of those beliefs that you "hear a lot", but cannot source to anywhere in particular
Bros might say if you train longer than hour your testosterone DROPS (this is bad science)
Or you'll be told 1 hour is all you need because efficient training only takes that long
What is true?
The truth is that gym chains employ trainers by the hour and pay them per session, and because PTs only have 50-60 minutes with a client, they use that 1 hour workout as the model for everything they do
And it reinforces the idea that 1 hour is all you need
Reality is that workout length is context dependent
A "workout" is variable, how long it takes depends on a multitude of factors
Claiming carte blanche that 1 hour is superior is simply stupid
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Resting 2-3 minutes between sets leads to more strength and muscle gains than resting 1 minute
-Taking a broader perspective, a lot meatheads wanted to believe they could take short rest periods & turn their lifting somewhat cardiovascular, & this wouldn't affect gains