The Weymouth half marathon: flat, fast, but your legs arrive from the hills

The course

The run leg at IRONMAN 70.3 Weymouth is 21.2 km over 2.5 laps of the seafront, with just 29 m of stated elevation gain. T2 is at Lodmoor Country Park. On paper it's one of the fastest half marathons you'll find in a 70.3: no climbs, consistent surface, crowds along the course.

One warning: the course appears to have been revised recently, and race reports from 2019 and 2022 describe earlier versions. Check the number of laps and the course details on the official page before race day. Don't take anything you read in old reports for granted.

The real problem: your legs after the hills

The run is flat, but it comes after 90 km of hilly riding with over 1,000 m of stated climbing and ramps up to 12%. The classic risk is setting off at standalone half-marathon pace and blowing up at km 12. Two rules:

1. First 3 km under control: start 10-15 seconds/km slower than your target pace. On a flat course recovering time is easy, recovering from a blow-up isn't. 2. Aim for a negative split: if you still have legs on the final lap, that's where the run-leg PB gets built.

For reference, rough benchmarks (not official data) suggest: 2:30 for the relaxed finisher, 2:05 for a mid-pack target, 1:45 for those aiming high, 1:28 for the top age-groupers.

Aid stations: few stations, many passes

The lap structure works in your favour: in past editions three aid stations were passed eight times. That means a pass roughly every 2.5-3 km: hydrating is easy, but that's exactly why you need a plan, otherwise you'll either skip stations or overdo it.

A concrete strategy:

• Decide BEFORE the race what you'll take at each pass: water at one, carbs at the next, nothing at the one after.
• On course you'll find Maurten gels and Precision Fuel PH 1000: test them in training or carry all your own in a race belt.
• With highs around 19°C the heat risk is low, but don't skip hydration entirely: the sea breeze can mask how much you're sweating.

Weather and conditions

September on the English seafront means near-perfect running temperatures: highs around 19°C. The variable is the wind. The seafront is exposed: in windy editions the headwind sections cost you, and with 2.5 laps you'll face them several times. If it's blowing on race day, accept losing a few seconds/km into the wind and claw them back in the tailwind sections, rather than forcing yourself to hold a fixed pace.

How to prepare for it

The key workout for this course is the brick off a hilly bike:

• Example session: 60-90 minutes on the bike with repeated climbs, then 20-40 minutes of running at race pace on flat ground.
• Frequency: once a week in the 8-10 weeks before the race.
• Goal: teach your legs to turn over fast on the flat after power surges on the climbs.

Add a few long runs with a progressive finish: at Weymouth the final laps are run with your head, and the repetitive seafront layout can wear on you mentally. Break the race down mentally into segments from aid station to aid station: eight passes, eight micro-goals.

The decision to make

If you're choosing this race to chase a time: the Weymouth run allows it, but only if you accept riding the bike conservatively. Decide now which leg you want to prioritise. On this course, whoever gains 5 minutes on the bike often loses 10 on the run.