Are running injuries always running problems? Rehabbing a triathlete with a running injury can be an interesting challenge. Sometimes running is the culprit. Volume scaled too quickly, too much intensity, or maybe a need for a bit of strength training to expose the tissues. One area that does not get enough attention is the bike as a potential contributor to a running related injury. Note: it is not the first thing I am reviewing but it is part of my assessment. Fatigue knows no boundaries. You do not get special bike fatigue, run fatigue, swim fatigue. I've found this to be an overlooked piece of the puzzle in a handful of novice/intermediate level triathletes that have sought my assistance at Elite Edge Sport & Performance. The running wasn't obviously excessive, yet their "easy" rides were anything but. By the time they started running, they were already operating with tired legs and compromised movement. It made me wonder whether we sometimes spend so much time scrutinizing the run that we forget to ask whether the bike has an influence that is not immutable. Fatigue across sports A hard push on the bike doesn’t directly injure your running, but it does change the environment in which you’re running. Every hard ride leaves behind residual fatigue. Sometimes that’s exactly what we want. But if every “easy” ride slowly creeps toward moderate or threshold intensity, that fatigue begins to accumulate, and eventually, the run is no longer being performed on fresh legs. Yes, there is a time and place to run on fresh legs as a triathlete. That doesn’t automatically lead to injury. In fact, you have to practice running in a fatigued state to really get the most out of your triathlon training BUT..... when done habitually and maybe in excess because the bike seems "lower load", it can influence how an athlete moves, how much force tissues have to tolerate, and how much recovery is available before the next session. When I evaluate an injured triathlete, that becomes an important question. Not “Is the bike causing the injury?” Instead: “Is the bike making the run more difficult than it needs to be?” Interestingly, this isn't much different than how I think about improving an athlete's run split in a race. This is where rehabilitation and performance become closely linked. If you have the opportunity to do everything a little more thoughtfully (and ultimately perform better) why wouldn't you? We don’t want athletes arriving at T2 feeling like they survived the bike. If an athlete consistently burns too many matches during training rides, they’re practicing running in a state that may not reflect the goal of either rehabilitation or performance. Sometimes the solution is creating a bike program that has an appropriate distribution of easy days and hard days and leaves enough in the tank to actually run well rather than adding more run volume. It is a case by case scenario, but it is something to consider. In short, do not train the bike like it is just a free pass to do whatever you please.