I love running and doing it consistently over ~10 years, always longing to get out again. I'm the only one among my friends that do this, and I find this to be

I love running and doing it consistently over ~10 years, always longing to get out again. I'm the only one among my friends that do this, and I find this to be highly correlated with my running style: Really comfortable pace 7-10km through local forests, only (I tend to do more 10km more than 7km as I like it so much). I learned this one time when I ran on a threadmill and realized the enormous difference between a slight variation in speed (from 11 to 9 km/h in my case, but the exact numbers don't matter), where I realized with this slight change I could go on indefinitely instead of being quickly exhausted.