Overtraining metrics, schmmetrics. Sure, heart rate variability, power output, and all that jazz can provide insights. But let's face it, sometimes you're just feeling knackered because, well, life happens. As for recovery, it's not always about structured rest. I've had some of my best rides after a day of gardening or a lazy afternoon on the sofa. And cross-training? Pah! I've seen folks swap bikes for surfboards, skiis, or even the odd dance class. Each to their own, I say. Just remember, there's no one-size-fits-all approach to cycling or training. ;-D