Should I just pick the highest PL alternate within the workout’s targeted difficulty?

Might be fine, assuming you are able to execute the workout to the desired intent. The first question I have is why? I can imagine one or two reasons, but understanding exactly why you want to do it and what you hope to gain vs following AT are important details.

If my research is correct and consistent, Productive starts a 0.1 higher than your current PL and goes to 1.0 higher. Seems that TR aims around 0.5 for steps above current PL if all else is equal.

Outside of that, picking a top of the range option may be a minor kick up in value, or as much a 0.9 higher. That may be enough to turn a “good” workout into a “bad” one that leads you to potential bailouts, or at the very least more stress than TR intends in the scope of your training plan.

Point being that looking at a single instance is one thing, considering the fuller picture of your week and training plan overall is important. Unless you are using this approach to “accelerate” your progression from some form of reset (like a PL drop after an FTP change), I think this approach would lead to issues in a relatively short order (1 or 2 weeks as a guess).

I’d urge caution and consideration of your plan progression and make choices like this knowing the potential risk, and that you may well need to alter your tweaks if/when things change.

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