If I had a dollar for every time I am confronted with this question… well, I’d have a lot of dollars. I’m sure almost everyone who trains on a regular basis can empathize. Generally speaking, if your body is telling you it’s tired, you should probably take a break and not train that day. The problem is distinguishing between the actual signals your body is giving you versus the desire to be lazy and sit on the couch. Truth be told, missing one workout isn’t going to kill anyone. But you don’t want it to become the norm.
Which brings us back to the simple day-to-day question. To rest or to train? The best solution I have found is a two-step process. If either step indicates I need to rest, I rest.
Following a written schedule and tracking your day-to-day resting heart rate takes a lot of guesswork out of the “To rest or to train?” conundrum. Over time, you will become more aware of your body and its recovery capabilities, which is pretty cool.