This topic has been discussed before but I'm curious about a few things. When it comes to leg training I only really get any results (size / strength) from high reps volume training. For example, a program I did with 5sets of triples working up in weight over a month gave me almost nothing. Whereas a 4 sets of 20 program (still progressively overloading) yielded great results. On top of that my maxes went up more than focusing on heavy weight as well.

The best mix i found to increase the squat is several months of volume training with high frequency (squatting 3-4 times a week) followed by a program with low, at most 3 rep maxes.

Is this normal? Why would this be? What does it mean for training, just focus on what works (the high volume high frequency)? Thoughts/experiences?