This past Sunday I started a heavy training cycle. It has been 24 weeks since my last heavy cycle.
As I train more and more Iearn better ways to challenge my body. I consistently conduct the Experiment of One and apply what I learn. One thing I have learned is that my body can't take a heavy cycle for more than 6 weeks at a time.
Changing things up is an important principle to learn. Do not overdo it. Don't be the person who changes exercises constantly. Be the person who sticks with a plan and changes it up every 4 to 6 weeks. You will find that your results will improve if you do.