I  was struggling with the twin concept of the need for good form and the need to lift heavy to develop strength and size.  Then I discovered Double Pyramid Training from an article on the internet and tried it out this morning.  I try and increase the weight I squat each time I do a squat session - once a week usually - but was aware that the heavier I lifted the shorter the squat and wasn't sure whether that was achieving a whole lot.  I felt that I might be concentrating too much on trying to lift heavier but doing it less and less well.  So, I started with 40kg and did good form, moved up to 80kg and still was able to do good form, increased to 100kg - my previous personal best - and my form suffered a bit - I suppose I am being a bit cautious as I am trying to avoid any injuries.  Then upped it to 110kg - the adrenaline took over as I set a new record for myself.  Still did the same number of reps, 10, but with poorer form.  That's were I'd usually stop but this time I worked my way down through the weights again.  By the time I got back to 40kg, my muscles were burning but because it was a light weight I was still able to have good form.  I'm going to try this with all my work-outs from now on.  Happy lifting folks