Olympic Triathlon Swim Training: 1.5km Preparation Guide

Training for the 1.5km Olympic triathlon swim requires 2-3 pool sessions per week focusing on technique efficiency, threshold pace work, and open water skills.

The Olympic swim leg takes 25-40 minutes for most age-groupers—long enough that efficiency matters more than raw power. This guide covers everything you need to prepare for the 1.5km swim.

Swim Time Targets

Calculate your expected swim time: Olympic Triathlon Calculator

Weekly Training Structure

Beginner (2 sessions/week)

Intermediate (2-3 sessions/week)

Advanced (3-4 sessions/week)

Key Workouts

1. Technique Session

Purpose: Improve efficiency, reduce energy expenditure

Warm-up: 200m easy, mixed strokes
Drill Set:
  4 x 50m catch-up drill, 15s rest
  4 x 50m fingertip drag, 15s rest
  4 x 50m single-arm, 15s rest
Main Set:
  6 x 100m as 25m drill / 75m swim, 20s rest
  Focus on one technique element
Cool-down: 200m easy
Total: 1,800m

2. CSS Threshold Session

Purpose: Build sustainable race pace fitness

First, determine your CSS pace using our CSS Calculator.

Warm-up: 300m easy, building pace
         4 x 50m as 25m drill/25m swim
Pre-main: 4 x 100m descending 1-4, 20s rest
Main Set:
  5 x 200m at CSS pace, 15s rest
  OR
  10 x 100m at CSS pace, 10s rest
Cool-down: 200m easy
Total: 2,400-2,600m

3. Endurance Session

Purpose: Build capacity to swim 1.5km continuously

Warm-up: 400m easy, mixed
Main Set:
  Continuous swim: 1,500-2,000m
  Keep steady pace throughout
  Practice sighting every 10 strokes
  Alternate breathing every 3 strokes
Cool-down: 200m easy
Total: 2,100-2,600m

4. Race Simulation

Purpose: Practice race-day execution

Warm-up: 300m easy
         4 x 50m building to race pace
Race Simulation:
  1,500m continuous at race effort
  Sight every 8-10 strokes
  Practice race start (first 200m faster)
Cool-down: 300m easy
Total: 2,100m

Technique Fundamentals

Body Position

• Head: Neutral, looking slightly forward/down
• Hips: High, near surface
• Core: Engaged, stable
• Legs: Light kick, from hips

Common mistake: Head too high, causing hips to drop

Catch and Pull

• Entry: Fingertips first, shoulder-width
• Catch: Early vertical forearm (EVF)
• Pull: Press water toward feet, not down
• Exit: Past hip, thumb brushes thigh

Common mistake: Dropping elbow during pull

Breathing

• Bilateral: Breathe every 3 strokes when possible
• Rotation: Turn head with body rotation
• Timing: Breathe in the "bow wave" pocket
• Exhale: Continuously underwater

Common mistake: Lifting head to breathe instead of rotating

Essential Drills

Learn more: Triathlon Swim Technique Guide

Building to 1.5km

If You Can Currently Swim:

400m continuously:

• Week 1-2: Build to 600m
• Week 3-4: Build to 800m
• Week 5-6: Build to 1,000m
• Week 7-8: Build to 1,200m
• Week 9-10: Build to 1,500m
• Week 11-12: Race confidence

1,000m continuously:

• Week 1-2: 1,200m
• Week 3-4: 1,400m
• Week 5-6: 1,600m
• Week 7+: Maintain, add speed work

Progression Tips

• Add 100-200m per week maximum
• Include rest intervals initially (100m swim, 10s rest)
• Reduce rest intervals over time
• Focus on technique, not speed

Open Water Skills

Sighting

• Lift eyes only, not whole head
• Sight on every 6-10 strokes
• Use large landmarks, not just buoys
• Practice in the pool (eyes closed, then sight)

Drafting

• Behind: Directly behind feet saves ~15%
• Hip: Slightly behind at hip saves ~10%
• Stay legal distance (no grabbing feet!)

Navigation

• Swim to outside of buoys in crowded conditions
• Take wide line if inside is congested
• Sight early and often

Race Starts

• Position based on ability
• Protect yourself in first 200m
• Find clear water, then settle

Read more: Open Water Swimming Guide

Pool vs Open Water

Key Differences

Open Water Practice

If racing in open water:

• Practice in open water at least 3-4 times before race
• Get comfortable with wetsuit swimming
• Practice sighting and navigation
• Build confidence in deep water

Wetsuit Considerations

Benefits

• 5-10% faster times
• Improved buoyancy
• Warmth in cold water
• More relaxed swimming

Technique Adjustments

• Less kick needed (wetsuit provides lift)
• Higher hand entry
• Focus on catch, not kick
• Practice taking it off quickly

Learn more: Triathlon Wetsuit Swimming

Common Swimming Mistakes

1. Too Much Kick

Problem: Exhausts legs needed for bike/run Solution: Light 2-beat kick, let wetsuit provide buoyancy

2. Going Out Too Fast

Problem: Die in second half of swim Solution: Start controlled, negative split

3. Neglecting Technique

Problem: More fitness doesn't equal faster times Solution: Regular drill work, video analysis if possible

4. Pool-Only Training

Problem: Surprised by open water conditions Solution: Open water practice before race

5. Ignoring CSS Training

Problem: No sustainable race pace Solution: Regular CSS sets at threshold

Sample 12-Week Swim Progression

Related Resources

• CSS Calculator - Find your threshold pace
• Olympic Triathlon Calculator - Predict race times
• Triathlon Swim Technique Guide - Master efficiency
• Open Water Swimming Guide - OWS preparation
• 12-Week Olympic Training Plan - Complete program