You know the expression "it's like riding a bike?" It means once you've learned how to do something, it's hard to ever forget. Unfortunately, the same goes for bad cycling habits. Mashing refers to a kind of cycling method that many cyclists use, but most training coaches frown upon. It has to do with what's called your cycling cadence, and if you're getting ready for a bike race or need to improve your cycling performance for a triathlon, you'll want to start paying attention to this.