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Yes you will. Wide grips pullups work your lats. So doing any will work your back. 50 was just the amount he said to do. If you're weak it'll take you a while to do them. But as you get stronger it will take you less and less time to do all 50, so of course your back strength would increase.
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"Great spirits have always encountered violent opposition from mediocre minds" -- Albert Einstein
"A clear indication of women's superiority over man is their refusal to play air guitar." --Frank Zappa
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