IRONMAN 70.3 Rio de Janeiro

Arrive early to get eyes on the entry/exit and line up based on your expected pace; 1901 m goes by fast, so avoid starting too wide or too deep. Do a quick warm-up to raise body temperature, then a few short accelerations so you settle into your stroke on the first pull. In the first few minutes, focus on calm breathing and positioning—stay just outside the densest pack so you’re not constantly braking or crossing lanes.

You’ll cover 1901 m in freshwater where temperature varies, so start a little controlled and let your body find rhythm. With currents/water movement unknown, keep your head steady and aim for repeatable laps rather than chasing sight lines. Because the venue can change how buoyant you feel, use consistent effort (not constant “push” strokes) and save turnover for the final 200–300 m. Don’t try to fuel in the water; transition cleanly so you can start eating/drinking right away on the bike.

Plan your T1 as a “get ready, don’t race” routine: control your heart rate after the swim, transition efficiently, and get your kit on without fumbling. As you mount, straighten out quickly, establish cadence, and settle into your target effort before you fully commit. Expect rolling terrain and a steady SE wind; during the first 10–15 minutes, focus on smooth power and steady breathing rather than spike surges.

The bike is 89.9 km with 490 m of elevation on a rolling profile, so you’ll feel repeated opportunities to surge and repeated moments where your legs ask for restraint. With wind 5 m/s from the SE, expect crosswinds/gusts to affect comfort and line choice—stay smooth, keep your aero position stable, and don’t overreact to steering inputs. Fueling should be consistent: aim for 90 g carbs, 750 mg sodium, and 650 ml fluid per hour, taking in early enough that you’re never “catching up.” On the climbs/turning points, prioritize steady power and cadence; on the flatter sections, use the wind to your advantage but stay controlled so you don’t blow up before the run.

Your T2 strategy is to manage the first minutes: expect your quads and calves to feel “stiff” off the bike, so shorten your stride slightly and focus on quick, light steps. After mounting the run, start conservatively for a few minutes, then gradually build as your rhythm returns. Mentally rehearse your first hydration/gels spot so you’re not making nutrition decisions late.

The run is 21.1 km with profile unknown, so treat it like a disciplined, rolling-feeling course until you learn how the terrain impacts your pace. With air temperatures typically in the 18–24.8°C range and moderate heat, regulate effort early—overreaching in the first half is the fastest way to lose the ability to finish strong. Keep your cadence and breathing consistent; when the legs feel heavy, resist “powering through” with bigger strides and instead find smoother mechanics. Fuel and drink consistently with your plan (90 g carbs, 750 mg sodium, 650 ml fluid per hour), adjusting only for how your stomach and thirst respond.