Originally Posted by
ntornado
To be honest when you work your way up in weight on this .... you may only have enough in you to do one set. This has happened to me a bunch. See how you go and experiment.
I am not sure of the answer to your question.
The thinking behind it (I assume) is that you do your 10 curls, not too tough so now your biceps are a little tired, then you do the shoulders and rows so now your shoulders are upper back is a little fatigued. You then have to do the last 10 curls with all biceps no cheating and it is tough!