Most half marathon plans you find online are built for a generic, imaginary runner with a fixed, open week. Your week is not like that. You have a job, a commute, people who depend on you, and sessions you already do for reasons that have nothing to do with a race. A plan that ignores all of that will ask you for time you do not have, and when you miss sessions you will feel like you let it down when really, the opposite is true. The plan did not account for your life.
So the first job is not finding the best plan. It is finding the plan you can actually complete in the schedule you actually have. Here is how to make that decision.
Start with the days you can genuinely train
Be honest about how many days a week you can run, not how many you wish you could. A plan that assumes five running days when you can reliably manage three will leave you behind from the first week. Count the days that are realistic across a normal month, including the weeks when work runs late or the kids are ill.
Most half marathon plans are written for three, four, or five running days a week. Match the plan to your real number. Three well-chosen days you complete will take you further than five days you keep missing. For more information, read our guide on how to choose the right half marathon training plan for you.
Look at the long run before anything else
The long run is the session a half marathon plan is built around, and it is usually the hardest one to fit in. Check where the plan puts it and how long it gets near the end. Ask yourself a plain question: is there a day most weeks when you can be out for that length of time without it collapsing the rest of your life?
For many runners that day is the weekend, often tied to something they already do, like a Saturday parkrun they extend into a longer run, or a Sunday morning before the house wakes up. If the plan’s long run lands on a day you can never protect, that plan does not fit, however good it looks.
Count the weekly hours, not just the days
Two plans with the same number of running days can ask for very different amounts of time. One might keep weekday runs short and put the hours into one long weekend session. Another might spread longer midweek runs across several days. Add up a rough total for a typical week in the middle of the plan and compare it against the time you can give.
If the total is more than you can sustain, you have two sensible options. Choose a plan built on fewer hours, or accept that you will adapt the bigger plan down and plan how you will do that before you start, rather than discovering it mid-week.
Check how much structure you want to follow
Some plans prescribe a specific session for every day, with target paces and distances. Others give you a weekly shape and leave the detail to you. Neither is better. The question is which one you will actually stick to.
If detailed instructions help you stop overthinking and just run, a prescriptive plan suits you. If rigid daily targets make you feel trapped and more likely to abandon the whole thing when you miss one, choose a plan with more room to move the pieces around your week.
Decide in advance how you will handle a missed session
Every plan assumes you will complete every session. You will not, because life does not cooperate, and that is normal. The plans that work in real life are the ones you can bend without breaking.
Before you start, decide your own rule for a missed session. Usually the simplest rule is to let a missed easy run go rather than cram it in later, and to protect the long run and your sleep instead. Trying to make up everything you missed is how a busy week turns into an injury or a week where you stop altogether.
Build your existing sessions in, not over
If you already swim on a Wednesday lunchtime because that is when the pool is quiet, or you go to a coached class you value, treat those as fixed. A good plan works around the training you already do rather than stacking on top of it. Map your existing week first, then see where a half marathon plan’s sessions can honestly fit into the gaps. If they cannot fit without you dropping something that matters, that is useful information about whether the plan fits your week.
Respect the easy weeks and the taper
Most half marathon plans include weeks where the volume drops, and a taper where training eases in the last stretch before the race. An easier week can feel wrong, as though you are losing fitness or being lazy. You are not. Easier weeks are when your body absorbs the training you have already done, and the taper is what lets you arrive at the start line fresh rather than tired.
When you compare plans, check that they include this easing. A plan that only ever goes up is harder on your body and harder on your week, and it does not leave you anywhere to recover when a hard few days at work land on top of a hard few days of running.
Know the warning signs that mean stop
Training for a half marathon asks a lot of your body, and no plan should be followed through pain. If you develop pain that changes how you run, a niggle that gets worse week on week rather than settling, chest pain, or you feel faint or unwell during a run, stop and see a GP or physio, and call emergency services if it is severe or sudden. Always consult a medical professional when you take on structured training, including after injury or illness.
Make the choice
Put the pieces together. Choose the plan whose running days match the days you can train, whose long run lands on a day you can protect, whose weekly hours fit the time you have, and whose structure matches how you like to be told what to do. Then decide your rule for the weeks that go sideways. A plan chosen this way is one you can finish, and finishing is what gets you to the start line ready.
If you’re looking aiming for a marathon instead of a half marathon, read our guide on how to find the right marathon plan based on your schedule, base and goals, and how to step up from half to full marathon training without burning out.
Revay builds a running plan around the week you actually have and adapts it to what you report about your training, sleep, and how you feel. If you would like to hear more, sign up below for information about the beta and we will let you know when it is ready. Say hello any time at hello@revay.app.