Guides
What the research actually says about running, walking, and starting over after years off.
Start with whichever question brought you here.
The science behind running
What running does to your heart, your muscle, and how fast both of them age.
Is running bad for your knees?
The research points the other way, and the thing that actually hurts beginners is not the running.
Running vs walking: what each one does for your body
At the same energy cost the health returns are close. Bone, aerobic ceiling, and time are where they part.
Should you walk or run?
Walking is the most accessible exercise there is. That is not a consolation prize, it is the reason to start there.
What is a masters athlete?
An age bracket, not a performance standard. The difference changes how you read the research.
What is a good running heart rate for your age?
Age formulas give you a population average. Your own heart gives you a number that is actually yours.
What is zone 2 running?
The easy end of aerobic training. Useful, genuinely evidence-backed, and more confusing than it needs to be.
Running through perimenopause and menopause
Bone loss accelerates around the final period. Running is one of the few things that loads bone hard enough to matter.
Why new runners get hurt
Novice runners are injured at more than twice the rate of experienced ones. The reason is not your body.