RE: How important is it to increase weight?
Increasing in weight in not the be all and end all but is generally a marker for progress. There will come a point where you are lifting within your limits so the body will have no need to add muscle.
Once I can get 3x8 I up the weight and start down at 3x6 aiming to add a rep or 2 each week, sometimes I exceed this sometime I fall short, c'est la vie
Limits, like fear, are often just an illusion: MJ 12/9/09 My journal