All your hard work can fly out the window if you aren’t careful.

I’m nearly halfway there. It’s week five, and this is right around the time that people tend to get lazy. With seven more weeks of training left, it’s easy to fool myself into thinking: I got this.

Yes, I’m getting stronger, faster and more confident in my fitness. But that doesn’t mean I’m not making a few mistakes along the way. If you’re ready to start training for a marathon or half-marathon, watch out for these five rookie mistakes that could throw you off track and derail your progress: