The marathon: 16+ weeks from base to the start line

Updated July 9, 2026 · By the Runked team

The marathon is a different animal from every shorter race. A 5K punishes a bad day for 20 minutes; the marathon punishes it for hours, and it exposes every shortcut you took in training. The good news: it is remarkably trainable. You don't need elite genetics to run 26.2 miles well, you need months of consistent aerobic work, a long run that grows patiently, and the discipline to recover so the training actually sticks.

What actually gets you through 26.2 miles

• Aerobic base. The vast majority of your running should be easy. The marathon is almost entirely an aerobic event, and easy mileage is what builds the engine.
• The long run. The single most important session. It teaches your body to burn fuel efficiently and keep form for hours, and it builds the mental durability the late miles demand.
• Marathon-pace work. Running at goal pace, often inside a long run, so race effort feels rehearsed rather than foreign on the day.
• Recovery discipline. Cutback weeks, easy days, and real rest. The marathon block breaks people who treat every run as a test.

How long, and how many miles

Give yourself 16 to 20 weeks from a genuine running base. First-timers typically peak around 30 to 40 miles a week, with the long run building toward 18 to 20 miles. Experienced runners chasing a time might reach 50 to 70. Whatever the number, raise it gradually and take a lighter cutback week every third or fourth week so your body absorbs the load instead of accumulating damage.

The phases of a marathon block

A well-built plan moves through distinct phases, and Runked maps its training to exactly these:

• Foundation — build aerobic base and durability with mostly easy running.
• Early Quality — introduce controlled intensity to start sharpening.
• Transition — shift the emphasis toward marathon-specific endurance and pace.
• Race Prep — peak long runs and marathon-pace work, the hardest and most specific stretch.
• Taper — cut volume, keep a little intensity, arrive fresh.
• Recovery — the deliberate easing that lets you bounce back after the race.

The named workouts you'll meet

Marathon blocks reach for some of the sport's classic sessions:

• Marathon Pace Long Run — a long run with a substantial chunk at goal pace, the most race-specific session in the plan.
• Long Run with Surges — an easy long run broken up by short faster segments, teaching your legs to change gear when fatigued.
• Yasso 800s — ten 800m repeats. The folklore, from Bart Yasso, is that the average time in minutes:seconds roughly mirrors your marathon in hours:minutes; 3:30 repeats hint at a 3:30 marathon. It's a fun benchmark and a genuinely useful workout, not a promise.
• The Michigan — a demanding alternating session of tempo running and faster track intervals, prized for building race toughness.

Avoiding the classic blowup

The marathon's cruelest trap is doing too much, too soon, and arriving at the start line overcooked. This is where Runked's performance metrics (part of PRO) earn their keep. The Load Ratio (ACWR) compares your recent training load to your longer-term base and flags a Caution or High Risk zone when your mileage is climbing faster than your body can absorb. Paired with Fitness & Fatigue tracking, it tells you when to push and, just as importantly, when to back off before a niggle becomes a stress fracture. The runners who finish marathons strong are usually the ones who trained conservatively enough to reach the start line healthy.

When life happens

Over four or five months, something will interrupt your training. Runked's status selector lets you set Rest, Sick, or Injured to pause the plan, then resume as Active when you're ready, rather than staring at a wall of missed workouts. A marathon block you can adapt is a marathon block you'll actually complete.

Frequently asked questions