The Best 3 Day a Week Half Marathon Training Plan (For Busy or Injury-Prone Runners)

Training for a half-marathon is a real time investment—between runs, recovery, strength work, and everything else life throws at you, it can start to feel like a part-time job.

But not everyone can (or should) run five or six days a week. Maybe your schedule is packed, maybe you’re coming back from injury, or maybe you simply do better when you run every other day and give your body more time to absorb the training.

That’s where a 3-day-a-week half-marathon plan shines. Done right, it can build the endurance you need for 13.1 without beating you up, because the goal isn’t to cram in more running, it’s to make your three runs count.

Before we get into the plan, here’s the big picture: your week will usually include one easy run, one “quality” workout (tempo/intervals), and one long run, with optional cross-training or strength work on non-running days to support fitness and stay healthy.

In this guide, I’ll break down exactly how to train for a half marathon on three runs per week—and then I’ll lay out our complete 3-day-a-week training plan to get you to the start line feeling prepared and confident.

What “3 Days A Week” Really Means

It’s worth clearing something up right away: a 3-day-a-week half marathon plan can be a bit of a misnomer. It sounds barebones, but it isn’t necessarily “easy” or minimal.

The “3 days a week” part simply means you’re running only three days per week. To get the best results (and stay healthy), you’ll usually add cross-training and/or strength work on some of the non-running days—so your total weekly training commitment is often more than three days.

Yes, it is possible to train for a half-marathon with only three runs per week and no supplemental work. But if you want stronger fitness, better durability, and a lower injury risk, the cross-training sessions in the plan are a big part of what makes this approach actually work.

Who Is This Plan For?

This plan is a great fit for runners who are injury-prone, short on time, or who simply don’t want to run day after day. It also works well if you enjoy a bit more variety in your routine and want to build fitness with a mix of running, cross-training, and strength work, and not just logging miles.

Because running is a high-impact sport, a three-days-a-week approach can be the most realistic (and often the healthiest) way to reach the start line, and the finish line, feeling strong instead of beat up.

That said, if you’ve previously trained with higher-mileage, this style of plan may not be the best choice if your main goal is a major PR. It’s designed first and foremost for consistency, durability, and finishing well instead of maximizing peak performance at all costs.

With that said, a 3-day training program is typically just enough to cross this threshold to help provide the specificity in your training to help your body make the necessary physiological adaptations for running a half-marathon.

At the same time, the program’s cross-training workouts can supplement your aerobic fitness while simultaneously reducing the impact stress on your bones and joints.

The primary drawbacks of training for a half-marathon running three days a week are:

• The fact that you still have to cross-train, meaning that you might not be saving as much time as you might think, particularly if you need to commute to and from a gym for cross-training workouts.
• It may not allow you to reach your full potential or set a PR, depending on your fitness and experience levels and your half-marathon race goal.

Our 3 Day A Week Half Marathon Training Plan

Here are a few tips for the workouts you will find in this 12-week plan:

• Cross Training: Any form of non-running aerobic workout. Examples include cycling, swimming, rowing, elliptical, aqua jogging, and hiking.
• Distance Run: Base-building run to improve your endurance. These should be run at a comfortable pace, around a 3-4 on a rate of perceived exertion scale.
• Easy Run: Run at a conversational pace to aid recovery from harder workouts. These should be a 3-4 on an RPE scale.
• Strides: Short accelerations mixed in to easy runs.
• Long Run: Long endurance runs to improve physical and mental stamina.
• Threshold Workout and Tempo Run: Run at a pace you can sustain all out for one hour, or at a 6 on the RPE scale.

For more of our half-marathon training plans, check out our database filled with half marathon training programs for all levels and timeframes here: