Sweat-wicking shirts! Compression socks! Non-bouncing shades! UV-proof hats! Neck buffs! Trail shoes! Gaiters! Racing shoes, carbon-plated! Recovery flipflops! Base layers! Jackets, rain and windproof! Reflective gear! A smartwatch! Training plans! Runners' memoirs! Club membership! Race signup fees! Gels! Electrolyte mix! Protein bars!

And have you tried spirulina, it does wonders for recovery (so they say)

"All you need is a pair of running shoes!" And another. And another. And another. Ad infinitum $$$