We also tend to steer people away from endurance because training it can interfere with strength and power gains.
With endurance work, we run into the following problems (not an exhaustive list)
- Like mentioned, fiber typing and the alteration of type IIa to type I (instead of IIb)
- Time invested in endurance leaves less time available for strength training
- The up-regulation of Adenosinemonophosphate Kinase (AMPk) which inhibits protein synthesis
- Preference and efficiency of energy pathways; oxidative phosphorylative -vs.- glycolytic (one of the mechanisms behind this is the fiber typing)
- Catecholamines and their resultant effects of catabolism, specifically degradation of protein -vs.- insulin and its resultant effects of anabolism, specifically inhibition of protein degradation (more directly a diet issue but in a practical setting this kinda comes with each territory respectively)
And this is just how endurance work
interferes with strength & power gains, not even mentioning it it tends to not
help/transfer over very much.
And thanks to the novice effect, person A finds that doing some P90x or cute bodyweight circuit of sit-ups and push-ups will notice a good amunt of gain (at least compared to staying stagnant like they've been) and claim that it's the holy grail to size/strength/endurance/sexiness/achieving transcendentalism.
