70.3

IRONMAN 70.3 Muscat

Saturday, 6 February 2027

IRONMAN 70.3 Muscat is a wetsuit-legal 1.9 km swim followed by a rolling 89.9 km bike (591 m gain) and then a flat, fast 20.4 km run, where disciplined fueling (90 g carbs, 1000 mg sodium, 800 ml fluid per hour) keeps you strong in moderate heat with a steady NW breeze.

· 125 days to go
Air
17–25°
typical
Wind
5.9 NW
prevailing
Water
24°
typical — confirm
Bike climb
+591 m
Fueling — per hour
typical conditions
90 g
carbs
1000 mg
sodium
+250 mg vs typical
825 ml
fluid
+175 ml vs typical
  • 💧 Plan fluids toward 825 ml/h (cap near 1–1.2 L/h and let thirst be the ceiling). It typically runs hot through the afternoon.
  • 🧂 Lift sodium to ~1000 mg/h.
  • 🍚 Keep carbs at 90 g/h — don't add more in the heat, and keep your drink mix dilute so fluid still empties fast.
  • ⏱️ Sodium preload: ~500–750 ml with ~1,000 mg sodium, 60–90 min before the start.
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Based on 10-year typical conditions (~25°). Baseline for a ~5.5 h finish, 70 kg athlete. Scale to your own body mass and sweat rate.

Typical 10-year conditions, not a forecast. Water temperature and the wetsuit ruling are set on race morning — check the IRONMAN race guide →

Worlds qualification — slots TBAsee who qualified →
0 km45 km90 km149 m
89.9 km · +591 m climbing
T1 — swim to bike

Your T1 goal is speed without sloppy steps: get out of wet gear quickly, secure everything (helmet, sunglasses, shoes) and start the bike with clean, consistent pedaling. After mounting, spend the first few minutes gradually building from swim-to-bike stiffness into aerobic cadence. Because the course is rolling, mentally plan to ride the crests controlled and save the bursts for the flats—don’t get pulled into over-gearing early. Practice your drink routine immediately after you settle (you want to be drinking before you feel thirsty).

During the bike

The bike is 89.9 km with 591 m of rolling elevation, so expect repeated surges and opportunities to manage power on the climbs and recover on the descents/shallower sections. With wind about 5.9 m/s from the NW, ride expecting some cross/headwind effects on exposed sections; keep your body position stable and don’t fight the wind with big, inefficient steering corrections. Use the rolling terrain to regulate effort: push slightly on the uphill segments while keeping your heart rate and breathing from spiking, then stay composed through the downhills and flats. Fueling should match the race targets: aim for 90 g carbs and 1000 mg sodium per hour, plus about 800 ml fluid per hour—start early and spread it evenly, not in one large dose at the end. If you’re losing fluids (wind/cooling plus heat), prioritize steady sips and don’t “catch up” all at once; your run depends on starting the transition hydrated and fueled.

Closing notes

Ride for consistency on the rolling course: steady power into every hill, controlled positioning into the NW wind, and fuel on schedule so the run starts with capacity.

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Weather is a 10-year climatology (typical, not a forecast). Course tracks are approximate, derived for planning — verify against the official course. Maps © OpenStreetMap. Not affiliated with or endorsed by the IRONMAN Group.