I get worn out riding it... But only when I ride 12 hours and over 150 miles of trails. I've never been worn out with my bike on just the average ride of 6 hours or so. I've had friends get worn out from 5 hour rides and im just getting started and they are riding bikes that are way lighter than mine and shorter. im a big guy (6 foot 220 some pounds) and old blue and I just handle everything. im just sitting in my garage right now listening to music and typing all of this on my phone haha.there was a wr450 on my last ride, what a tank compared to my bike, or even to the crf450r that was there, sure wore the rider out, and he is a big, strong guy(former college football star).