IRONMAN 70.3 Melbourne

Get a quick warm-up before you line up so your first 5–10 minutes feel smooth: a few easy strokes plus short accelerations to bring your breathing under control. Seed based on your realistic swim pace; being too far back usually turns the opening swim into a traffic jam. In the first minutes, settle into a calm, repeatable rhythm and aim to sight early and often so you don’t drift as the field spreads.

You’ll cover 1,901 m in ~17.5°C water; with typical Melbourne conditions, focus on staying relaxed—let the crowd momentum help you, but don’t sprint the first buoy. Build gradually: after the first 100–200 m, lock into a steady stroke rate and keep your lines clean to minimize extra distance. Take advantage of any calmer lines to sight efficiently and avoid constant steering. Fueling-wise, plan to start carb intake as you’re permitted on the course—your target is 90 g carbs/hr with 750 mg sodium/hr; if you can’t consume much during the swim, make up the gap immediately after T1 so you’re not behind for the bike.

In T1, get in/out efficiently: dry off just enough to prevent slippage, put on socks/shoes with no fumbling, and cap your helmet/strap check quickly. Set up your bike so you can mount cleanly and start pedaling immediately. As you roll out of T1 onto the 90.3 km flat/fast course, stay seated and transition into your race power gradually for the first few minutes while the legs wake up.

The bike is 90.3 km with 251 m of climbing on a flat/fast profile, so it’s easy to overcook early—especially with manageable heat. Wind is the real variable: expect steady wind around 6.2 m/s from the SW, so keep an eye on crosswind feel and small steering corrections, especially at any exposed sections. Use a smooth cadence and steady power rather than surging; if you’re using a headwind section, protect yourself from the temptation to “make up time” by spiking power. Hit fueling consistently: target 90 g carbs/hr and 750 mg sodium/hr, along with ~650 ml fluid/hr; take fluids in regular sips so you’re neither chasing nor under-drinking. Because heat is moderate and temps range from about 10.6–20.3°C, you’ll likely absorb better than in hot conditions—still, don’t wait until you feel thirsty. If the course offers any downhills, use them for technique and composure, but keep your intake rhythm—don’t let speed derail your fueling.

In T2, expect the first minute to feel “off”: the goal is to re-center your cadence and breathing before you chase speed. Transition fast—shoes on, settle your socks if needed, and start with shorter, quicker steps while your calves recalibrate from cycling. Mentally commit to an even start and let pace build only if your fueling and breathing feel stable.

You’ll run 21.5 km with just 9 m of gain, so the course is flat/fast and pacing discipline matters more than climbing. With moderate heat and a cool-to-mild air range (10.6–20.3°C), you can lock into rhythm early—aim to keep effort steady rather than sprinting through the first kilometers. The SW wind can still affect comfort and perceived effort at exposed parts; stay relaxed through the torso and keep your stride efficient. Keep fueling the whole time based on your target: 90 g carbs/hr and 750 mg sodium/hr, and maintain ~650 ml fluid/hr as needed by thirst and aid-station availability. On a flat course, it’s common to feel good at halfway—this is where overreaching shows up later, so keep your pace tethered to your plan and use fluids to manage any rising heat sensation.