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Actually I kinda been through this mini-debate with a family member of mine. She reasons that in a 5K run, she is putting out every bit of energy that a 100M sprinter is, except longer, on the basis that she couldn't possibly better her time. This seems odd to me, but okay.
Here too the definition of "peak performance" will come down to semantics, I guess. 16 games is the NFL. To characterize all the Seahawk practices as less than peak seems odd to me; most NFL players say they'd play the games for free and it's the practices you have to pay them for.
I have more respect for football practice than the average bear, perhaps. :- )