www.run4prs.com Everyone has goals to see improvement. It is what gets us hooked on running. We love seeing growth and the efforts of our hard work paying off. But it actually takes a bit of time to see improvements on a physiological level with endurance sports.  Law of diminishing returns You will see bigger gains at the beginning of a new training cycle/process. The longer you have been working out/running the more you will hard to do to see improvements Improvement in form/mental training/pacing There are multiple ways someone can improve. Simply improving your pacing to give you faster times immediately without any additional fitness being gained How long do you see improved VO2MAX actual physical gains? 6 weeks You can start losing them at 2 weeks It’s easier to gain back fitness than it is to get fit in the first place