Each plan will state the level of runner it is aimed at based on previous times and what you’re expected to be able to complete during week 1 in order to safely progress to run your event at the end of the plan if you don’t yet have any personal bests (PRS).
For example,
The sub 50 10k Training Plan is designed for runners who want to run inside 50mins for 10k. If you have run close to 50mins before or ran around 23-26mins for 5k and 1:50-54 for the half marathon distance then this plan is perfect for you.
This plan is aimed at runners who can already run up to 6-miles during week 1 of the training schedule. If you’re not yet here I would suggest building up to this distance prior to starting the plan. The plan peaks around 28-miles per week.
Unlike generic plans on the internet my training plans are designed specifically for your current fitness level and time goal on race day.