>General Running>What exactly changes when you improve?
I've just startet running (log is public) and just from a few low intensity runs I can already feel a huge improvement. Not in speed, but in how I feel during the runs.
What I'm wondering, just out of curiosity, is what's happening to my body? What makes me able to run longer and feel better in just two weeks?
an amazing likeness
Your body is responding to this new workload by increasing abilities for oxygen uptake and delivery; more red blood cell, increasing lung capacity, heart muscle strengthens, etc -- its overall capability in taking in oxygen and moving to your muscles.
Acceptable at a dance, invaluable in a shipwreck.
Yeah, milktruck's got it. Specifically my understanding from the little I've read on the subject is that the *first* things to change are blood volume and capillarization. But I've never worried too much about it beyond understanding that training works!
rebuilding r2th v2.0
The OP mentions changes in 2 weeks of training with no improvement in speed but just overall comfort. It's unlikely that any major cardiovascular changes have occurred within that time frame. The physiological adaptations that milktruck and mike mentioned take weeks if not months to take place. My guess is that the adaptations that make Stki feel more comfortable are more neuromuscular in nature - activating neural circuits that wire running. These make running feel easier because the entire nervous system has now more or better 'connections' to coordinate legs and arms motions during running. These physiological adaptations typically happen much faster than cardiovascular changes and are likely to explain the fact that the OP feels better. This is why people add strides to easy running - there is no real increase of training load in terms or cardio, but these wire the body for leg turnover/faster running and make you run faster without any major cardiovascular changes.
Yes, early on at 2 weeks it is more neuromuscular vs physiological changes. It is running skill. Your body is learning to run. Think of learning to walk or riding a bike as a kid. The skill improves week to week.
THE RECOVERY MAN. Run Injury Free. Free Recovery Report www.smartapproachtraining.com