IRONMAN 70.3 Tallinn

Arrive early, get your shoes/transition items sorted, and do a short warm-up in the water so your arms feel “loose” before the start. When you seed, choose a pace you can hold over the full 1,901m—don’t gamble for crowded positioning that forces extra starts and braking. In the first few minutes, focus on controlled breathing and clean lines rather than sprinting; settle into rhythm quickly and aim for a smooth, steady cadence.

You’re swimming 1,901m in freshwater where the temperature can vary, so prioritize comfort and efficient movement over early intensity. The course is typically paced as a continuous effort—think “build to steady,” not “race the first 200m,” especially if the water feels cooler than expected. Drafting and sighting matter: keep your head lifting minimal and consistent so you don’t widen your path. Fueling during the swim is generally not the priority; save your planned 90g carbs/hour and 750mg sodium/hour for the bike and run.

Your swim-to-bike transition should be about flow: move methodically from wetsuit (if used) to towel/gear, rack your bike cleanly, then mount without rushing your cadence. Use the first segment to stabilize—get your water bottle in hand, confirm hydration is working, and find a gear where you can hold a smooth, repeatable rhythm. Plan your first 10–15 minutes as “controlled fast,” not aggressive, so you set up your 89.5km flat/fast ride without spiking effort.

The bike is 89.5km with 256m elevation gain on a flat/fast profile, so power discipline is the key—when the course feels easy, it’s easy to overcook. With wind around 4.7 m/s from the SW, expect crosswind and headwind/tailwind sections that can tug your line and change how the bike feels; stay relaxed in your upper body and make small steering corrections rather than fighting the bike. Aim to follow your fueling plan consistently: 90g carbs/hour, 750mg sodium/hour, and about 650 ml fluid per hour, using the flat speed to keep intake reliable even when you feel “great.” Take in carbs regularly from the start of the ride, and don’t wait for hunger—also use sodium early to support steady sweating and performance in moderate heat. Keep braking/safety in mind at any turns; on a fast course, straight-line speed matters, but stability through corners protects your run legs.

In T2, focus on getting your stride back under you quickly. Your first steps should feel controlled—light turnover, relaxed shoulders—because the bike-to-run shift can make you overstride or surge early. Take a second to confirm you’re starting on your planned effort, not chasing the feeling from the bike, and start hydrating immediately as you settle into pace.

The run is 21.2km with 37m elevation gain and a flat/fast profile, which means pacing mistakes are mostly effort-based, not hill-based. With moderate air temperatures (13.4–21.2°C range), you’ll still want to manage overheating: use water to cool if offered, and keep your breathing steady early so you don’t fade later. The wind can still influence your work—if you feel surges or resistance in open sections, shift your focus to cadence and smooth form rather than trying to “power through” every headwind gust. Fueling targets should carry over from the bike: aim for 90g carbs/hour and 750mg sodium/hour while taking fluid around 650 ml per hour, using aid stations to stay on schedule. If you’re running low on fluid, sodium without water can backfire—so make sure you’re pairing carbs/sodium with actual intake and cooling.