OK, we need to get clear how you measure performance.
Focus obviously has effect on the amount of sweat per hour, because you dont get disturbed while concentrating. The effect is a positive one and does not need to be tested, it's a fact.
But these are interesting performance criteria:
- Do you get more successful pulls when you are focused?
- Do you get more sweat per successful pull when focused?
My gut feeling tells me it does not make any difference, but if someone is determined to do a test with a large enough amount of tries, it could be interesting.
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