How long does it take to see changes? An untrained person will
make a great deal of progress in the amount of weight that they
can lift initially, but little of that is due to an increase in
muscle strength, per se. During this period, the body learns how
to recruit muscle units during exercise effectively. Once they
become effective at recruiting muscle units - and this usually
takes place in 4 to 8 weeks - then muscles can be overloaded
during exercise, and stimulated into hypertrophy. If you've been
working out for a month and a half, you should be almost
finished with the break-in period. In the next couple of months,
you should notice muscle gains.