By Nick Harris | Head Coach & Founder, Speedy Swimming & Stealth Endurance Coaching

With 10 days to go until IRONMAN 70.3 Weymouth on September 20th, the hard physical training is done. You cannot gain any extra fitness between now and race day—but you can lose time if you don’t taper correctly or mismanage your pacing.

Weymouth looks like a fast, achievable middle-distance triathlon—and it can be. But small pacing mistakes on the rolling Dorset bike course or early panic in the sea swim will get exposed on the flat, relentless run.

The athletes who perform best are not necessarily those with the biggest engines. They are the ones who understand the course, control their effort, and execute a disciplined race plan.

Here is your complete guide to managing the final 10 days and executing your best race.

1. The 10-Day Taper Strategy: Less Volume, Keep the Sharpness

The goal of the final 10 days is to reduce overall fatigue while keeping your neuromuscular system primed.

• Reduce Volume, Maintain Intensity: Drop your total volume by 40–50%, but keep brief bursts of race-pace effort (e.g., 3 x 2 minutes at 70.3 pace during a short bike or run) so your legs don’t feel sluggish.
• Prioritise Sleep & Recovery: Aim for consistent, quality sleep—especially two nights before the race (Friday night), as pre-race jitters often disrupt Saturday night’s sleep.
• Carb Loading Without Overeating: You don’t need to double your meal size. Starting 48 hours out, simply shift your dietary proportion toward clean, low-fibre carbohydrates (white rice, oats, bagels, pasta) while reducing heavy fats and fiber.

2. The Swim: Mastering the Weymouth Sea Swim

Racing in the sea brings unpredictable elements: swell, tidal movement, sighting challenges, and lower water temperatures.

The Three Biggest Swim Mistakes 10 Days Out

1. Starting Too Hard: Adrenaline at the beach start spikes your heart rate and shortens your stroke.
   • The Fix: Settle into your rhythm over the first 300 metres. Think: “Smooth first, fast later.”
2. Lifting Too High to Sight: Lifting your entire head out of the water drops your hips and causes heavy drag.
   • The Fix: Use a low-profile sight (eyes just clear of the water as your arm extends) integrated into your normal breathing cycle.
3. Neglecting Final Wetsuit Checks: Don’t let race morning be the first time you’ve worn your wetsuit in weeks. Ensure your body glide is packed, shoulder mobility is primed, and you’ve tested your goggle seal in saltwater.

Key Taper Swim Session (7–10 Days Out)

• Warm-up: 300m easy
• Main Set: 4 x 200m as (100m steady 70.3 pace / 50m build / 50m easy) with 20s rest
• Sighting Drill: 6 x 50m practicing low-profile sighting every 6 strokes
• Cool Down: 150m easy
• Focus: Catch timing, high-elbow recovery, and efficient sighting.

3. The Bike Course: Pacing the Rolling Dorset Hills

The 90km Weymouth bike course features rolling Dorset countryside. It is not brutally mountainous, but repeated micro-efforts over the small rises will drain your legs for the run if you push too hard.

Race Pacing Strategy

• First 30km (Hold Back): The natural temptation is to push hard out of T1. Keep your effort strictly controlled (around 80–85% of FTP or Zone 2 HR). You should feel like you are holding back.
• Middle 30km (Settle In): Maintain aero position, keep a smooth cadence (85–95 RPM), and execute your nutrition plan (aiming for 60–90g of carbs per hour depending on your strategy).
• Final 30km (Prep for the Run): Avoid burning matches on the final rises. Spin your legs out on downhill sections to flush out lactate and prepare your legs for T2.

Key Taper Bike Session (5–7 Days Out)

• 60 Minutes Total: 15 min warm-up, 3 x 4 minutes @ 70.3 target power/effort with 3 min easy recovery, 15 min cool down. Keep cadence high and stay relaxed in the aero bars.

4. The Run: Winning the Final 21.1km

Weymouth’s flat run course along the esplanade is spectator-friendly and fast, but its flatness means there are no natural opportunities to coast or rest.

The Perfect 70.3 Run Execution

• First 5km: Control your enthusiasm. Your legs will feel light coming off the bike, and the crowds will be loud. Force yourself to run 5–10 seconds per km slower than your target average.
• 5km to 15km: Find your baseline race rhythm. Stay consistent with fluid and electrolyte intake at aid stations.
• Final 6km: This is where the race truly starts. Dig in and use whatever reserves you have left to hold your pace to the finish line.

Key Taper Brick Session (4–5 Days Out)

• Bike: 45 minutes easy ride with 3 x 1-minute openers at race effort.
• Transition: Quick T2 practice.
• Run: 15 minutes brick run (First 5 min easy, 5 min at target 70.3 run pace, 5 min easy cool down).

5. Transition & Logistics Checklist

Transitions offer “free speed.” In the final week, double-check all gear and mental walkthroughs:

• T1 & T2 Walkthrough: Mentally map out your route from the swim exit to your bike rack, and from the bike mount line to your run bag/rack.
• Gear Inspection: Check your bike chain, tire pressure, gear shifting, and helmet strap. Inspect your wetsuit for tears and test your goggle straps.
• Nutrition Prep: Pack your gels, salt tablets, and hydration bottles. Never try a new gel brand or drink mix on race day.

Final Race Day Mindset

IRONMAN 70.3 Weymouth is won by the athletes who manage their energy best across all three disciplines:

1. Swim relaxed and build your rhythm.
2. Bike controlled and respect the rolling terrain.
3. Run strong by saving your best effort for the final 10km.

Trust the work you’ve put in during your training block, stick to your execution plan, and enjoy the atmosphere on the Dorset coast!

Need Coaching or Swim Technique Guidance for Future Races?

Through Speedy Swimming and Stealth Endurance Coaching, we help triathletes master open water technique, race pacing, and structured multi-sport preparation.

• 1:1 Video Analysis & Swim Squads (Guildford Lido)
• Open Water & Sea Swim Mastery Clinics
• Customised Training Plans & Coaching

Need Coaching or Race Preparation Guidance for Future Races?

Through Stealth Endurance Coaching (and our technique specialists at Speedy Swimming), we help triathletes master open water execution, race pacing, and structured multi-sport preparation.

• Structured Training Plans & 1:1 Coaching (Stealth Endurance Coaching)
• 1:1 Video Analysis & Swim Squads (Guildford Lido)
• Open Water & Sea Swim Mastery Clinics

Explore triathlon coaching options or get in touch at Stealth Endurance Coaching.