Ah, the great indoors vs. outdoors debate! It's like comparing apples to oranges, really. But since you've brought up the hybrid training approach, let's dive in.
So, how do we bridge the gap between indoor and outdoor metrics? A solid starting point would be to accept that each environment has its unique challenges and advantages. Indoors, you've got consistency, control, and measurability. Outdoors, you've got the elements, unpredictability, and a healthy dose of adventure.
Now, let's tackle your questions. Ensuring that indoor training translates to real-world performance? Well, it's not a perfect science, but the key is to incorporate both structured and unstructured rides in your training plan. This way, you're not only building power and endurance but also honing your bike-handling skills and mental focus.
As for the threshold where indoor metrics become irrelevant, I'd argue that it's less about dismissing the numbers and more about understanding their context. For instance, 250 watts on a hot summer day outdoors might feel vastly different than 250 watts in an air-conditioned pain cave.
Lastly, integrating factors like temperature, humidity, and mental focus into your training plan? That's where the art of coaching and self-experimentation comes in. Embrace the chaos, learn from it, and adapt your training accordingly. And hey, if you find yourself staring at a wall and twiddling your thumbs, just remember it's all part of the journey!