By Height By Weight  

5 feet 8 Male Before and After 26 lbs Weight Gain 155 lbs to 181 lbs

Here we have a progress pic showing a muscle gain from 155 pounds to 181 pounds. That's an impressive gain of 26 pounds.

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5 feet 8 Male Before and After 26 lbs Weight Gain 155 lbs to 181 lbs
M/34/5'8 [155 < 181 = +26lbs] 12(ish) months. Increased calories and consistent lifting. Slow and steady.