Goosey
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5x10 is my normal effort. Full extension too. None of this pussy half rep chit.
A proper chin-up for a set of 20 rep's is rare for a 80+ man, he would be really strong and really well built.
A bloke that would be like this would of been able to have done 10 easy and progress to 20 in a very short time, due to mostly fiber typing and not because of his workout method.