Two lifting sessions would be too much I'm thinkin...
Arnold did it. Be tough man, Ha Ha. Seriously though try lifting twice a day and see how you recover.
You can do individual muscles harder. The only thing is that it may be tougher to get stronger do
to overlapping muscles since you would theoretically be doing twice as many workouts. You would have to
see how your tendons and joints would fare also. Now doing cardio as the second workout would make
more sense when trying to get stronger. Recent studies show that it may be better to seperate cardio
and weight workouts to get optimum muscle building. It became popular to do 2 workouts a day in the
eighties. I don't know about now.