I always thought it was the other way around, it's more tiring if you were whiffing all night. Hitting air takes a lot out of a boxer, it sucks all power that the boxer put behind the punch.
Margo's got great whiskers, he needs it, because he is sooo hittable. Manny's a different story, he needs to put his licks in and get out fast. Since Manny moved up in weight (Diaz fight), were his opponents are way bigger and much more resilient to his power punches, plus the fact that they hit harder than his contemporaries who approximates his size (Barrera, Marquez & Morales), he has to pick his spots unlike before. He found out that it was a much better proposition for him to hit and not to get hit back in return.
True story...
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