The thing about training by yourself is you only compare yourself to well, yourself:
- How did I do the last time I ran this distance?
- How have I grown over these last few weeks of training?
- Ha! I'm totally beating that 70 year old walking slowly ahead of me!
- Hmmm they look like they're in much better shape than me.
- Yep, I'm definitely the fattest one here.
- They say they're a slow runner but they just lapped me for the second time.
- Why is no one else sweating as much as I am?