It probably won’t ever become the focus of a hit sports movie—not even if they call it Poosiers—but “poop doping” is a real thing and could possibly give competitive cyclists an edge. That’s according to microbiologist and mountain biker Lauren Petersen, who tells Bicycling magazine that after being sick for more than a decade with Lyme Disease, in 2014 she gave herself an at-home fecal transplant from somebody who happened to be another racer.Petersen says she not only felt much better after the stool transplant, she upped her training to five days a week and was winning races within months, though her experience proves correlation, not causation. “I wondered if I had gotten my microbiome from a couch potato, not a racer, if I would I be doing so well,” says Petersen. Petersen—who says the procedure was “not fun” but “pretty basic”—says she started collecting stool samples from top racers and found that a microorganism called Prevotella was found in almost all top racers but less than 10% of the general population. She is now doing more research into Prevotella, which is believed to help muscle recovery.