If I'm anticipating a long run to be especially difficult (if it's hot or I've added a couple more miles), I make sure that every song on my running playlist can get me up my steepest hill or through the longest miles. No filler tracks allowed. I'm no Marie Kondo expert, but I think the process is similar to the whole "sparking joy" thing: if it's a song I know I'll want to skip on the run, it's out. Also, listening to snippets from my playlist never fails to get me pumped up for a run. (If your playlist needs a revamp, here are a bunch of new songs we recommend.)
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