Am I ready for this plan?
Before starting a 12-week half marathon build, you should have a solid "base." This means you can currently run a 5K (3.1 miles) without stopping, and you are actively running at least 3 days a week. If you aren't there yet, try our Couch to 5k Plan first!
The Philosophy: Distance over Speed
For your first Half Marathon (13.1 miles or 21.1 kilometers), you have one goal: Finish the race upright and smiling.
Do not worry about a specific time goal. Trying to run "fast" during your first half marathon training block is the fastest way to get shin splints, runner's knee, or IT band syndrome. In this 12-week plan, every run should be performed at an easy, conversational pace. If you need to walk, you walk.
The 12-Week Schedule Overview
Your week will consist of 4 days of running, 2 days of rest, and 1 day of cross-training.
The Long Run Schedule
Saturday is the most important day of the week. This is where you actually build the endurance to tackle 13.1 miles. Do not skip the Long Run. By Week 10, completing a 16km (10-mile) run proves to your body and mind that you can finish the race.
| Week | Long Run Distance | Focus |
|---|---|---|
| 1 | 6.5 km (4 miles) | Getting used to the routine. |
| 2 | 8 km (5 miles) | Practicing hydration on the go. |
| 3 | 8 km (5 miles) | Consolidation week. Keep it easy. |
| 4 | 9.5 km (6 miles) | You are nearing the 10K mark! |
| 5 | 11 km (7 miles) | Experimenting with mid-run fueling (gels). |
| 6 | 8 km (5 miles) | Deload step-back week. Let legs recover. |
| 7 | 13 km (8 miles) | Your longest run ever. Pace yourself. |
| 8 | 14.5 km (9 miles) | Mental toughness starts here. |
| 9 | 11 km (7 miles) | Second deload step-back week. |
| 10 | 16 km (10 miles) | Peak week! If you run 10, you can run 13.1. |
| 11 | 9.5 km (6 miles) | Tapering begins. Let the muscles heal. |
| 12 | RACE DAY! 21.1 km | Trust your training. You are ready. |
Fueling and Hydration
Unlike a 5K, a Half Marathon requires in-race nutrition. Your body only stores enough glycogen for roughly 75-90 minutes of strenuous exercise. Because your first half marathon will likely take over 2 hours, you must replenish carbohydrates while running to avoid "hitting the wall."
- Rule of thumb: Consume 30 grams of carbohydrates (one running gel or a packet of chews) every 45 minutes during your long runs.
- Hydration: Drink water or electrolytes whenever you feel thirsty. Do not overdrink, as it can upset your stomach.
Tracking Your Journey Visually
A 12-week block requires incredible dedication. To make sure you don't waver during Week 6 when motivation dips, log your runs with Run&Grow. You'll build a virtual garden that physically proves the work you've put in. Every Saturday Long Run earns you rare plants to showcase your marathon build.