Start with the simulator. See your odds, likely finish range, and realistic pace band. Then decide whether you want to improve those odds with a training plan, weekly check-ins, or better race-day decisions.
What are my odds of hitting this goal?
What finish range looks realistic today?
What should I tune next if I want to improve those odds?
It does not promise an exact race result.
It does not replace a coach or clinical testing.
It is built to improve decisions, not pretend uncertainty does not exist.
Use the simulator to pressure-test a goal, use a training plan to improve the odds, and keep coming back weekly to see whether the outlook is getting stronger or softer.