<p>Bob shares another great lesson that he learned from the OFA challenge... which is opportunity cost. </p>

Bob shares another great lesson that he learned from the OFA challenge... which is opportunity cost.

<p>Bob shares another great lesson that he learned from the OFA challenge... which is opportunity cost.&nbsp;</p>

Jack of All Trades... Master of None.

Welcome to the GainsTherapy Express, where Bob Chang talks about business, fitness, physical therapy and documents his journey on building GainsTherapy.

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Jack of All Trades... Master of None.

Jack of All Trades... Master of None.