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42.195 kilometers. Sounds impossible if you’ve only just started running. But it’s not. The average marathon finisher takes 4 hours and 30 minutes—and a year ago, they had no idea they could do it. The Haspa Marathon Hamburg on April 26, 2026, expects 40,000 participants. Many of them will be running their first. This guide shows you the 16-week path from your sofa to the starting line.

Sources: haspa-marathon-hamburg.de (2026), RunRepeat Marathon Statistics

What Is a Marathon and What Does Your Body Need?

What is a marathon? A marathon is a road race covering the standardized distance of 42,195 kilometers. The distance traces back to the legendary run of the messenger Pheidippides from Marathon to Athens in 490 BC. Today, the marathon is the crown jewel of mass participation sports and is run in more than 800 events worldwide each year.

To cover 42 kilometers, your body needs one thing above all: endurance at a low intensity level. Most beginners run their marathon in the so-called aerobic zone—meaning at an intensity where your body primarily uses fat as its energy source. If you’re already familiar with Zone-2 training, you know the principle: sustained effort at a low heart rate. That’s exactly your marathon engine.

The good news: You don’t need to be an athlete. The average finish time is 4 hours and 30 minutes. That’s a pace of about 6 minutes and 24 seconds per kilometer—only slightly faster than brisk walking. A marathon isn’t a sprint. It’s a test of patience.

The 16-Week Plan: Step by Step to Your Goal

Sixteen weeks is the gold standard for marathon preparation for beginners. It’s possible to train in less time, but it’s risky. A longer period is better—if you can maintain the discipline. The plan is divided into four phases:

Phase 1: Foundation (Weeks 1 to 4)

Three runs per week: two shorter runs (30 to 40 minutes) during the week and one long run on the weekend. The long run starts at 8 kilometers and increases by 2 kilometers each week. Pace: you should be able to hold a conversation while running. If you’re gasping for air, you’re going too fast. If you’ve only just started running, consider extending this phase to six weeks.

Phase 2: Build-up (Weeks 5 to 10)

Your weekly mileage increases. The shorter runs get longer (45 to 60 minutes). The long run climbs to 20–25 kilometers. Every third week is a recovery week with 20 percent less volume, giving your body time to recover. During this phase, add a fourth workout: an easy recovery run, or alternatively cycling or swimming for 30 to 40 minutes.

Phase 3: Peak (Weeks 11 to 13)

This is when you complete the longest training runs of your preparation. The long run reaches 30 to 35 kilometers. Don’t run faster than marathon pace. These runs are as mentally important as they are physical: you’ll learn what kilometer 25 feels like and how your body reacts when glycogen stores run low. One or two tempo runs (20 minutes at your target marathon pace) sharpen your sense of pace.

Phase 4: Tapering (Weeks 14 to 16)

The secret weapon of marathon preparation. Training volume drops by 40 to 50 percent. No more long runs. Stick to short, easy runs, prioritize plenty of sleep, and eat well. Your body repairs micro-damage and replenishes energy stores. In the final week before the marathon: no more than three short, easy runs, each under 30 minutes. You’ll likely feel restless—this is normal and actually a good sign.

The Four Most Common Beginner Mistakes

Mistake 1: Going too fast, too often. The most common error. Beginners run their easy runs too fast because slow running feels unproductive. But 80 percent of your training volume should be in Zone 2: conversational pace, without panting. Fast workouts should make up only 20 percent. If all your runs are at the same pace, you’re training your intermediate system while neglecting your aerobic base.

Mistake 2: Skipping the long run. The weekend long run is the most important workout of the week. Here, you train your fat metabolism, mental resilience, and ability to stay in motion for hours. Missing a long run is worse than missing three short runs.

Mistake 3: Ignoring recovery. Two rest days per week aren’t a sign of weakness—they’re part of training. You don’t get stronger while running, but during the recovery afterward. Sleep, nutrition, and passive recovery (stretching, foam rolling) determine the quality of your next workout.

Mistake 4: Trying something new on race day. New shoes, new gels, new breakfast—anything you use on race day must be tested in training first. Your stomach doesn’t know a gel if you swallow it for the first time at kilometer 18. Test everything beforehand during your long runs.

Nutrition and Hydration: What Your Body Needs

A marathon depletes your glycogen stores after about 90 minutes. After that, your body switches to burning fat, which provides energy more slowly. This is the infamous “hitting the wall” at around kilometer 30.

Before the race: Increase your carbohydrate intake three days before the marathon (carbo-loading). On race morning, eat a light breakfast 2 to 3 hours beforehand: oatmeal, banana, toast with honey. Nothing you haven’t tested before.

During the race: Start drinking at kilometer 5, then every 20 minutes. From kilometer 15 to 18 onward, take energy gels or bars every 30 to 45 minutes. Most marathon events offer aid stations every 5 kilometers. The Haspa Marathon Hamburg provides refreshment points at 8 locations along the course.

After the race: Within the first 30 minutes after finishing: consume carbohydrates and protein. A protein shake, a banana, and plenty of water. Over the next 24 hours, eat and drink generously. Your body needs to repair itself.

Hamburg Marathon 2026: Your Gateway to the Marathon World

The Haspa Marathon Hamburg on April 26, 2026 celebrates its 40th edition. Some 40,000 runners are expected. The course runs along wide boulevards, past the harbor and along the Elbe River. Nearly flat, perfect for fast times and first-time marathoners.

Not sure whether the full distance is right for you? Hamburg also offers a half marathon (21.1 km) and a relay marathon. The half marathon is an excellent first step. If you finish it in under 2 hours 30 minutes, you’re ready for the full marathon the following year.

Other major spring marathons in Germany: Hannover Marathon (April 26, 2026), Düsseldorf Marathon (May), and the classic Berlin Marathon in September as an autumn goal. The 2026 season offers plenty of options for every fitness level.

A marathon isn’t a sprint. It’s a project. 16 weeks of systematic preparation, three to four training sessions per week, and respect for the distance. What once seemed like 42 impossible kilometers becomes achievable, step by step. When you cross that finish line, you’ll understand why marathon runners say: The hardest part isn’t the race. It’s making the decision to begin.

Header image source: Pexels / RUN 4 FFWPU (px:9855172)