Due to rather vicious Chicago winter, I finally broke down and bought a treadmill. Slipping on the ice has lost it's appeal at 55.
And I was very surprised to find that, though it seems like almost twice the effort, I'm more consistent (less rests), my heartbeat tends to stay around or under 150, and I feel like I could virtually go on forever on the treadmill.
As spring is finally slouching towards the Midwest, I've recently run outside a couple of times. And even though it feels far easier than the treadmill does, my heart rate shoots up past 160, I'm less consistent during the run, and I'm really glad when it's over.
Though my mildly asthmatic lungs probably have something to do with it, I don't understand why I do so much better on the treadmill despite the fact that it feels like so much more work.
Any thoughts? Thanks!