Back in the 1980’s, I was reading a book about body building. I think it was authored by Arnold Schwarzenegger. It said something like: “If you want to have big arms, you have to have a big chest; And if you want to have a big chest, you have to have big legs”.
Well, back then, I didn’t really understand how the legs and arms were related. It made sense to me that the arms and chest were related, because you can’t really train your chest without training your arms. But you don’t have to use your arms at all to train your legs.
Then in the 1990’s I went to Chiropractic school. I started learning about hormones by reading Guyton’s Textbook of Medical Physiology Eighth Edition. On page 825 it taught me that there were times when growth hormone secretion was higher, like after strenuous exercise.
I also learned that more physical stress creates more demand and larger growth hormone releases; And that more growth hormones meant better physical strength, greater endurance, more muscle, higher metabolism, and less fat.
Suddenly what the terminator said made sense. By training your legs, you create much more physical stress on the body. This would create more growth hormones that would improve the strength and size of your arms – whether you trained them or not!
Now knowing that, I like to make sure I am first training the larger muscle groups – particularly the legs, thighs, gluteals, and lower back muscles – to create the physical stress on the body that will demand greater growth hormone releases. This is a key to more youthful physical abilities even in our later years.