You may find that you gain strength after one workout.This isn't because you've gained more muscle,
it's caused because of your weight training skills. The first time you try an exercise your more caught up in the
proper form and technique and you waste a lot of energy trying to get the hang of it.Once you have the hang
of it, you can concentrate in lifting the weight.
Secondly, your muscles have memory.Therefore, after one workout your muscles and nerves remember
and your brain tells your muscles "you remember this, it's time to exercise"
The first 6 weeks you weight train, most of strength gains are caused by skill and muscle memory.
After 6 weeks your muscle fibers increase. Remember that larger muscles like your chest and back grow faster than your smaller
ones like arms and shoulders.