Not talking record-setting or even 5 minutes (unless that's what I'm asking about). To say "That guy is in decent shape core-wise".
I've read 90 seconds or 2 minutes. What say the M4C crowd?
I've also read that for core work (where planks are concerned) doing sets of less time is better than max'ing out each time. Will, I'll bet you can field this!
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