Lydiard on development

"The only way to build ability is to increase aerobic capacity. Many people try to improve their anaerobic capacity, which is beyond the capability of the human body. The only way to improve is to lift the aerobic base.
Most people will still be developing aerobic capacity 10 years after they start running, whatever age they start. So if you start at 40, you will still be developing the cardiovascular system 10 years later."


Arthur Lydiard

Running hard efforts all the time will get you somewhere fast, but can only be sustained for a few weeks.
Running slow produces slow runners.
Find the balance.