Half Marathon Training Readiness Checklist Are You Actually Ready to Start?

Run 3 miles (5km) continuously, at any pace, without walking — pass that and you're ready to start a beginner half marathon plan this week. Fall short at 1.5-2 miles and you need 2-3 weeks of run-walking first; under a mile means 4-6 weeks of base-building. Below: the full readiness checklist beyond the run test — weekly mileage consistency, the PAR-Q+ health screen, why cross-training fitness doesn't count, gear and logistics, and the sleep and stress threshold that matters as much as your legs.

Skip any one of these checks and the plan doesn't fail you gently — it fails you in week two or three, right when the missing base-building should have already happened. Most runners who stall early weren't undertrained across the board; they were missing one specific box on this list, not all of them, which is exactly why it's worth running through each one below rather than trusting a gut feeling.

The Continuous-Running Test: Can You Cover 3 Miles Unbroken?

This is the single objective pass/fail gate that almost nothing else states clearly. I use this exact test with every new athlete before assigning a plan — it catches the false positives that a mileage number alone misses.

Pass (3 miles unbroken): ready to start a beginner plan this week. Partial (1.5-2 miles): spend 2-3 weeks run-walking up to the full 3 miles before starting. Fail (under a mile): spend 4-6 weeks base-building first.

The Core Benchmark: Current Weekly Mileage and Consistency

Underneath the test sits a consistency benchmark: 15-20 miles/week across 3-5 days, sustained for at least 3 consecutive weeks — not a one-off good week. That's the baseline every credible source converges on for a first-time 12-week plan.

Health Clearance: The PAR-Q+ Self-Screen

Answer honestly. Do you have chest pain during activity? Dizziness? A joint problem that worsens with activity? A diagnosed heart or blood pressure condition? Are you on medication that affects your exercise response? Any single "yes" means see a doctor before starting. Don't self-diagnose past it.

Special Case: Aerobically Fit but Run-Inexperienced

Cardiovascular fitness from cycling or swimming does not transfer to tendon and bone load tolerance. I once assessed a strong cyclist doing 200+ miles a week on the bike who couldn't run 2 miles without walking. Even a strong cyclist should pass the same 3-mile running test and build run-specific volume over 3-4 weeks before starting a full plan — ignore your cross-sport VO2 max here, it isn't the relevant number.

Logistics Readiness: Time, Schedule, and Gear

Sort the practical side before week 1, not during it. Properly fitted running shoes, no more than 6 months or 300 miles old. A GPS watch or phone tracking method sorted. Race registration confirmed. And 3-4 fixed weekly time slots blocked on your calendar — training plans fail on logistics more often than fitness.

Life-Load Check: Sleep, Stress, and Recovery Bandwidth

Readiness isn't only physical. If you're averaging under 6 hours' sleep, or in a high-stress period — new job, house move, caregiving — for 3+ consecutive weeks, delay your plan start 2-4 weeks. I'll delay a plan start by a month before I'll let someone layer structured training onto a period of under 6 hours' sleep. The injury risk isn't worth the two extra weeks of base.

Your Pre-Training Readiness Checklist, All in One Place

What to Do If You're Not Quite Ready Yet

Don't stay stuck. Run a 3-4 week pre-plan bridge: 3 run-walk sessions a week, building from 10 to 20 minutes continuous, plus your PAR-Q+ check, before starting the beginner tier. Once you're through that bridge, move to picking your plan tier.

Frequently Asked Questions

What's the minimum weekly mileage before starting half marathon training?

15-20 miles/week across 3-5 days, sustained for at least 3 consecutive weeks, not a one-off good week. That's the baseline for starting a first-time 12-week plan.

How far should I be able to run continuously before starting a half marathon plan?

3 miles (5km), at any pace, without walking. If you can only manage 1.5-2 miles, spend 2-3 weeks run-walking up to the full 3 miles first. Under a mile means 4-6 weeks of base-building before you start.

Do I need a doctor's check before starting?

Only if you answer yes to a PAR-Q+ trigger question — chest pain, dizziness, joint problems that worsen with activity, a diagnosed heart or blood pressure condition, or medication affecting your exercise response. Any yes means see a doctor before starting; don't self-diagnose past it.

What if I'm fit from cycling or swimming but not running?

Your cardiovascular fitness doesn't transfer to tendon and bone load tolerance. Pass the same 3-mile running test as everyone else and build run-specific volume over 3-4 weeks before starting a full plan, ignoring your cross-sport fitness.

What's a sign I need a longer lead-in before starting?

Failing the 3-mile continuous-running test, or averaging under 6 hours' sleep during a high-stress period. Either signal means delaying your plan start by 2-6 weeks rather than layering structured training onto an unready base.

What gear should be sorted before week 1?

Properly fitted running shoes no more than 6 months or 300 miles old, a GPS watch or phone tracking method sorted, your race registration confirmed, and 3-4 fixed weekly time slots blocked on your calendar.

What is the simple test run I should try first?

Run 3 miles (5km) continuously, at any pace, without walking. I use this exact test with every new athlete before assigning a plan — it catches the false positives that a mileage number alone misses.

What if I pass some benchmarks but fail others?

Address the failed benchmark specifically before starting — don't average your readiness across categories. A strong mileage base doesn't offset a PAR-Q+ flag, and a clean health screen doesn't offset failing the continuous-run test.

How much sleep and recovery capacity do I need before starting?

At least 6 hours' average sleep and no major ongoing life stressor for the preceding 3+ weeks. I'll delay a plan start by a month before I'll let someone layer structured training onto a period of under 6 hours' sleep — the injury risk isn't worth the two extra weeks of base.

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