IRONMAN 70.3 Valdivia

Get to the swim start early, confirm your time/seed, and place yourself so you’re not trapped behind slower swimmers. Do a quick warm-up before you’re herded to the start: 5–10 minutes of easy freestyle plus a few short accelerations to “wake up” your stroke. In the first few minutes, commit to calm positioning and rhythm—avoid sprinting for position right away; settle into your breathing pattern so you exit the swim composed for the transition.

Swim 1,962 m in typical cool water around 14.6°C; wetsuit legality is commonly allowed, but for race morning confirm the official wetsuit ruling in the IRONMAN athlete guide. Plan to swim efficiently—this course is about speed-through-control rather than survival—so keep your head position steady and kick consistent but not exhausting. Because the air is cool (as low as ~9.1°C), your first minutes will feel tighter; once you’re into rhythm, focus on smooth pulls and long, efficient body line. Fueling during the swim isn’t the target—save your carbs/sodium plan for the bike where you can reliably absorb it.

Your T1 flow should be simple: get out of the swim shoes/gear system quickly, secure everything you need (helmet, sunglasses if you wear them, drink bottles/gels where you can reach them), and start spinning immediately once you’re riding. Off the bike, the first minutes are about settling your power and cadence—don’t chase speed early. Use the first part of the ride to confirm fit and comfort, then lock in your fueling routine so you’re never playing catch-up later in the 90.7 km.

Ride 90.7 km with 308 m of elevation gain on a flat/fast profile—this favors steady output and minimizing surges. With a light-to-moderate wind of 5 m/s from the SW, expect it to create small speed swings; keep your power even and let speed vary rather than ramping up on headwind sections. Because air temps can be as cool as ~9.1°C and warm up to ~18.9°C, dress and hydration matter—sip regularly and don’t wait until you feel hot to drink. Aim to hit your fueling targets continuously: 90 g carbs and 600 mg sodium per hour, along with about 500 ml of fluid per hour; take carbs at a cadence you can sustain (e.g., every 10–20 minutes) and use sodium to stay on top of cramping risk as the ride progresses. If you feel your breathing getting labored, the fix is usually earlier fueling and a slight reduction in power—not late “hero” effort.

In T2, expect your legs to feel heavy immediately after the bike—your job is to find turnover fast without sprinting. Make dismount-to-run feel intentional: grab what you need, rack/secure smoothly (no fumbling), and start the run with controlled effort for the first few minutes. Mentally cue “short, quick steps” for the first stretch to prevent overstriding while your calves and hip flexors wake up. Then lock into your pacing once you feel the stride loosen.

Run 21.1 km on a flat/fast profile with only 22 m of elevation gain—so the course won’t bail you out with hills; pacing discipline will matter more than tactics. With moderate heat and air temperatures ranging from about 9.1°C to 18.9°C, you should aim for a controlled start—don’t let cool conditions tempt an overly fast first section that costs you later. The wind (5 m/s from the SW) can still affect perceived effort; use effort/tempo to guide you rather than chasing pace through headwind sections. Keep fueling consistent through the run—continue your race fueling plan so you maintain carbs and sodium at the targeted rate (90 g carbs, 600 mg sodium, and 500 ml fluid per hour). If you notice stomach discomfort, slow intake slightly but don’t stop; adjust timing and sip rhythm to regain tolerance while staying on target as much as possible.