I did air alert 3. The whole shit , 16 weeks , back in May 2007 being ~32,5 years old.
Didn't gain a single inch, probably because my strength was very low back then , so ultra high volume plyos ( that AA is ) was useless.
I didn't have the slightest knee bugging during it , but then again i never had the slightest knee bugging in my entire life.
I think people without training background doing AA is pure waste of time. Dangerous for those with sensitive knees , just useless for all the others.
As for people with training background , they don't care for AA!
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