The first graph details the three likely outcomes of training: 'Too easy', 'Just right' or 'Too hard'.
The overcompensation theory is fundamental to all training and cannot be ignored if results are sought. In particular, always pay attention to the results of training too hard or too easy. While optimal is best... it's always better to train too little, than too much.
The second graph is what your training can look like, if you hit the sweet-spot routinely. This is why moderation and consistency are king - If you train right before you lose your gains, you repeat the cycle and keep getting improved results.
Check them out and please contact me if you'd like to work together, on finding that optimal balance.