IRONMAN San Juan

Arrive early and keep your pre-race warm-up gentle since the water is freshwater and temperature varies. In the seeding area, choose position based on your swim pace and comfort with S-side wind and any surface chop you feel when you enter. For the first few minutes, settle into a controlled rhythm (don’t chase early feet) and sight often enough to stay straight through the early traffic before you build.

You’ll cover 3798 m in freshwater (temperature varies), so expect that early feel can change as the race progresses. If there’s any wind-driven chop, keep your head position consistent and shorten your stroke slightly to maintain propulsion without overreaching. During the swim, prioritize efficient breathing and smooth turns/lines over “extra” intensity—your goal is arriving to T1 calm and fueled. At this distance, the best strategy is to keep the effort steady enough that you can run off the swim, not sprint into the first buoy-to-buoy segment.

On the swim-to-bike flow, practice quick efficiency: get out of the water, secure your transition setup, and move through T1 without rushing in a way that jangles your legs. Once you mount, give yourself a few minutes to find cadence before you commit to pace. With a flat/fast course, plan to start controlled for the first section so you can build once you’re fully settled. Carry that calm into the fueling routine from early in the ride so you’re not “behind” later.

You’ll ride 180.1 km on a flat/fast profile with 498 m of elevation gain—so it’s easier to drift into over-speed if the wind is favorable early. Expect wind of 5.7 m/s from the S; that means some stretches can feel like a headwind and others like a tailwind/cross—stay disciplined on power (or consistent effort) so you don’t spike when it’s aided. In hot conditions, drink consistently and don’t wait for thirst. Use your fueling target during the bike of 90 g carbs per hour, 1000 mg sodium per hour, and about 800 ml fluid per hour; aim to take it regularly rather than in big gaps.

On the bike-to-run transition (T2), expect “heavy” legs at first—this is normal on a fast course with 180.1 km behind you. Take the first few minutes to find your breathing and settle into an even stride rather than trying to force pace immediately. Get your drink strategy into motion right away so you stay ahead of heat.

You’ll run 42.2 km after the 180.1 km bike, and with hot conditions, the risk is starting too hot and accumulating dehydration early. The course profile is unknown, but plan your effort around temperature first: keep the first portion steady, then adjust based on how your body is absorbing fluid. Wind can influence how hot/cool the air feels at different points; if you feel a stronger headwind, don’t compensate by speeding up—hold form and cadence. On the run, continue your hydration and fueling strategy consistently (don’t “catch up” late), aiming to match your planned intake so you can sustain effort through the marathon distance.