Open Water Swim with Feed Station Practice

Session Overview

IRONMAN full-distance swims include a single feed station at the midpoint of the 3.8km course — a 2-buoy turnaround where athletes can take on nutrition. Practising this skill in training removes the uncertainty and wasted time of doing it for the first time in a race. This 60-minute open water session also builds sustained aerobic capacity at moderate effort with a focus on maintaining form in real conditions.

What You'll Need

• Wetsuit (if applicable to your race)
• Open water tow float for safety
• One gel or bottle of sports drink in a waterproof holder attached to your float (simulating race feed)
• GPS watch
• Swimming partner or support person onshore

Warm-Up (10 minutes)

Swim 300m easy to acclimatise. Include 4 x 25m sighting practice: every 6 strokes, lift eyes to sight a fixed landmark. Finish with 2 x 50m at controlled race effort to prime the aerobic system.

Main Set

Swim 2,000m as a continuous, structured effort that includes one feed station practice:

• 1,000m at steady aerobic pace (RPE 6): Focus on smooth stroke and consistent sighting every 8–10 strokes
• Feed station practice: At the 1,000m mark, slow to a gentle tread, retrieve your gel or drink from your float, consume it fully (practice this — it takes longer in cold water with gloved hands), and resume swimming within 45 seconds
• 1,000m at steady aerobic pace (RPE 6–7): Return to full effort, note if nutrition intake affected your breathing or comfort

Cool-Down (10 minutes)

Swim 300m very easy backcrawl or single-arm drill. On exiting the water, note how your stomach responded to mid-swim nutrition — this is critical information for race-day planning.

Coaching Notes

• Test multiple nutrition formats: liquid is easiest to consume while moving in water; gels work but require more coordination. Find what works for you in practice, not on race day.
• Practice in cold water — gel consistency changes dramatically at low temperatures, and cold hands make unwrapping harder. Test gel packaging before race day.
• Easier variation: Omit the mid-swim feed and focus on 2 x 1,000m with a 2-minute rest, practicing sighting throughout.
• Heart rate should stay in zone 2–3 throughout. If HR spikes during the feed stop, you are taking on nutrition too rapidly — slow down.