IRONMAN 70.3 World Championship

Arrive early so you can confirm the entry/exit points and any current or footing issues. Do a controlled warm-up (easy spin/stretch your shoulders/hips) and then spend your last few minutes finding a rhythm: calm breathing, steady cadence, and relaxed hands. If you’re offered seeding, place yourself based on your realistic swim pace to avoid early congestion. In the first minutes after the start, focus on forward position and even strokes—don’t chase every swimmer; settle into your lane and breathing pattern immediately.

You’re swimming 1.9 km in freshwater, and the temperature can vary—treat the first 10–15 minutes as “establish and settle” rather than all-out. With typical race-day friction from a crowded field, prioritize clean lines (don’t fight for every gap) and keep your breathing regular even if you get jostled. Drafting isn’t a concern in the way it is for cycling, but positioning is—stay calm, keep your head steady, and let the pack flow around you. Fueling on the swim is generally not the focus; instead, plan to be ready to transition quickly and start bike fueling on time.

Transition with intention: move efficiently through T1, get your bike fully secured, and start pedaling as soon as you’re moving. Before you’re fully “up to speed,” do a quick checklist—helmet secure, shoes on correctly, and hydration/fueling accessible (so you don’t fumble mid-ride). For the first few minutes, keep power controlled and cadence steady while you settle into the course and any wind exposure. Mentally set your fueling clock early so you’re taking carbs/sodium/fluid consistently from the start rather than catching up later.

You’ll cover 90 km with an unknown profile, so treat it as “managed effort with smart surges” rather than banking on a predictable climb/flat pattern. Wind at about 4 m/s from the N means you’ll likely have segments where you’re more exposed—keep your effort stable into the wind and avoid spiking power; when conditions are sheltered, you can recover slightly but don’t suddenly accelerate. With air temps ranging 18.8–26.3 C and moderate heat, start hydration early and stay ahead of thirst. Aim to hit 90 g carbs/hr, 1000 mg sodium/hr, and about 800 ml fluid/hr over the bike; take small, frequent intakes to reduce stomach stress, and adjust fluid slightly if you feel overheating building.

T2 is where the race often changes. As you transition from bike to run, focus on getting your heart rate up gradually rather than trying to sprint out of the gate. Settle into a smooth cadence immediately and keep the first 5–10 minutes conservative—your legs will feel “heavy to start” after 90 km, especially if you rode any harder than planned. Get your first hydration/electrolyte moment early and then lock into your run rhythm.

You’ll run 21.1 km after the bike, and with moderate heat (18.8–26.3 C) plus a steady breeze, managing effort is critical. The wind can feel like it helps for short stretches and then bites when you’re exposed—use it as a pacing cue, not a reason to change your run strategy dramatically. Since you’ve been targeting fueling on the bike, keep your intake consistent on the run using the same overall targets you planned (90 g carbs/hr, 1000 mg sodium/hr, ~800 ml fluid/hr), adjusting fluids downward if you’re not sweating much or upward if heat build-up is real. On later stages, if legs tighten up, shorten stride slightly and focus on quick feet and relaxed shoulders rather than forcing pace with big strides.