For instance, one of my friend's sister is training to become a personal trainer. She had told my friend that she shouldn't use the elliptical because it "makes your heart rate go high and you shouldn't do that." So my friend decided to only use the elliptical once a week because it's now "dangerous."
I also think of the myth of the "fat burning zone" that I have seen trainers (some, not all) spout off. Oh yes...who doesn't want to push themselves to the point of - gasp - actually having to work at exercise? Sounds good to me! And by the way, that WAS me for the first 2 years I got into exercising!Now that exercise is a daily part of my life, I can see times where I have "over trained" because I look at progress in terms of distance/time/overall average heart rate and maximum heart rate. But really, it's all about listening to my body. I can tell when I need to rest when I've had two bad runs in a row and feeling utterly wiped out for the rest of the evening after I've finished running. Like nelie, we also went hiking this weekend and by Sunday night, I was starting to feel it... I'm still feeling it today! But I decided to run yesterday anyway, just to see how tired I really was. Turns out, I wasn't over trained or tired at all and had my best 5k time to date.
I just think, above all, listen to your body. You know it best, and sometimes it's a live and learn experience, but eventually, you'll figure out how much your body can handle.


