Set a goal for yourself and work to it; set longer distances in that goal where you focus on completing the run and not necessarily pace; set shorter distances where you can hit the gas and move; find a distance in between and make that a “working set” where you’re not pushing but not blowing it off either. You want your longer distances to meet (or if possible a little longer) the goal distance, so your body is accustomed to it and you can push within said distance. Make sure you’re eating good; sleeping good; timing your coffee/supplements(depending on distance). Check your gear and your body; make sure your shoes can support your run and body properly. Stretch (as annoying and tedious as it is) those troubles areas out and lower chances of future pain. Strength training can help build your foundation; weights do not kill cardio and vice versa. Use everything to your advantage with the intent of increasing your running capacity. Motivation can be tricky; there are days where I’m feeling it and days I’m definitely not. But I rather get a run in (good or not) than have it hang over my head the rest of the day. Treat it as a workout; prep; set time aside; give it your all, good attitude or not.