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Half Marathon Rowing Training Plan: 21,097m on the Erg

April 16, 20264 min read

The half marathon (21,097m) on the rowing ergometer is a test of pacing discipline and sustained aerobic power. Unlike a 2k sprint, you can't rely on anaerobic capacity. The entire effort must be fuelled by your aerobic system.

What makes the half marathon different

A strong half-marathon erg time typically takes 75–90 minutes. At this duration, the physiological demands shift dramatically compared to shorter distances:

  • Energy system: 95%+ aerobic. Anaerobic contribution is negligible.
  • Pace stability: Maintaining consistent splits for 75+ minutes requires internal pacing skill.
  • Mental challenge: The middle third is where most rowers lose focus and pace.
  • Fuelling: Unlike a 2k, nutrition and hydration during the row matter for performance.

Pacing strategy

The single biggest mistake in half-marathon rowing is starting too fast. Even 2–3 seconds per 500m too quick in the first 5,000m can result in a dramatic slowdown after 15,000m.

Target pace calculation

Your half-marathon pace should be approximately UT1 to AT zone — roughly 14–18 seconds slower than your 2k split.

| 2K split | Approximate HM pace | Total time | |----------|---------------------|------------| | 1:40/500m | ~1:56–2:00/500m | ~80–84 min | | 1:50/500m | ~2:06–2:10/500m | ~88–92 min | | 2:00/500m | ~2:16–2:20/500m | ~96–100 min |

Pacing approach

  • First 5,000m: Settle into target pace. Don't chase a fast opening split.
  • 5,000–15,000m: Lock into rhythm. This is the grind — focus on technique and breathing.
  • 15,000–19,000m: Maintain pace despite growing fatigue. Break this section into 1,000m chunks.
  • Final 2,000m: If you have energy left, gradually increase pressure. If you're hanging on, just maintain.

Negative splitting (second half faster than first) is the goal. Even splits are acceptable. Positive splits (slowing down) mean you started too aggressively.

Training plan structure

A half-marathon training block runs 8–10 weeks and follows the same periodised approach as shorter-distance plans, with adjustments for the endurance demands.

Foundation (weeks 1–3)

Build a large aerobic base. This phase is even more important for half-marathon training than for 2k training.

  • Weekly volume: 60–100 km
  • Key sessions: 45–70 minute steady-state rows at UT2 pace
  • Stroke rate: 18–20 spm
  • Intensity split: 85% UT2, 10% UT1, 5% AT

Build (weeks 4–6)

Introduce threshold work while extending your longest steady-state row.

  • Weekly volume: 70–110 km
  • Key sessions: 60-minute steady-state; 3 × 15 min AT intervals; mixed-pace sessions
  • Stroke rate: 18–20 spm steady, 22–24 spm for threshold
  • Intensity split: 75% UT2/UT1, 15% AT, 10% TR

Specific (weeks 7–9)

Sessions start to simulate half-marathon conditions. Race-pace rehearsals at target split.

  • Key sessions: 2 × 30 min at half-marathon pace; 45 min progressive (start UT2, finish AT); 10,000m at target pace
  • Longest row: 60–75 minutes
  • Intensity split: 70% UT2/UT1, 20% AT, 10% TR

Taper (final week)

Cut volume by 50%. Keep 2–3 short sessions at or near target pace.

  • Key sessions: 20 min at HM pace; 5 × 1,000m at AT pace; easy 30 min UT2
  • Rest: Sleep and light activity

Key workouts

Long steady-state (weekly)

50–70 minutes at UT2. This is the backbone of half-marathon training. Build to your longest row gradually — add 5–10 minutes per week.

Threshold intervals (weekly)

3–4 × 12–15 min at AT pace with 3–4 min rest. These develop the lactate clearance capacity that lets you sustain a harder half-marathon pace.

Race-pace rehearsal (from week 7)

20–30 minutes at your target half-marathon split. Practice your pacing, hydration timing, and mental approach.

Progressive row (from week 5)

40–50 minutes, starting at UT2 and finishing the last 10 minutes at AT pace. Teaches pace control under cumulative fatigue.

Race day considerations

Warm up. 10 minutes of easy rowing plus a few short pickups. Don't waste energy on a long warm-up.

Hydrate. Have water within reach. Take small sips every 15–20 minutes.

Fuel. For efforts over 60 minutes, consider a sports drink or gel at the 40-minute mark. Practice this in training first.

Monitor. Set the PM5 display to show average pace. Watching instantaneous pace creates anxiety; average pace keeps you steady.

Stroke rate. 20–24 spm is typical for half-marathon pace. Higher rates increase cardiovascular cost without proportional speed gains at this duration.

Common mistakes

No long rows in training. If your longest training row is 30 minutes, a 75+ minute race will expose the gap.

Racing the first 5k. Adrenaline on test day makes it easy to start 3–4 seconds too fast. Set a pace alarm on the PM5.

Ignoring recovery. Half-marathon training volume is high. Rest days aren't optional.

ErgBuddy builds half-marathon training programs from your benchmark results, with phase progression and pacing calibrated to your current fitness. Try it free.