escyooz a butt-in from an unscientific mind. Apart from the idea of concentric-only exersizes being problematic (I understand you're experimenting here), weren't isometrics "proven" not to be as effective as dynamic movements a long time ago? And with isometrics, aren't you really just working fatigue thresholds? And my question about fatigue value wasn't answered over there yet to my satisfaction either. Maybe we don't have all the answers yet.