[swatcoder]

There’s no particular logic to it. It’s just fashion. Competitive bodybuilding favored certain styles of physique, and amateur bodybuilders developed a practice that pursued that style and adopted some folk beliefs/language that center around it.

Leg days are no “extreme effort” to dancers, cyclists, runners, gymnasts, etc

[xupybd]

Here is an old article discussing the topic

https://melmagazine.com/en-us/story/why-so-many-guys-dont-wo...