They said they tested 1,000 people for the genes (11 of them), then did tests to see if how they responded to exercise correlated to their gene test and they said it did.
They said they haven't found a form of exercise that works on the non-responders.
So basically even though the test shown involved a stationary bike, done 3 minutes a week, the researchers said if that doesn't work, nothing will. The degree to which that simple exercise works will indicate how well/fast you progress in any exercise form.
A super-responder would show a tremendous improvement in those 3 minutes a week. He/she would be able to flourish in any sport.
IMO, I would be extraordinarily surprised if it ends up being that simple. "hey, I want to bodybuild"..."well, get tested first, you dont want to waste your time" yikes!