7 Reasons You’re Struggling to Swim Further (And How to Fix Them)

Are you a triathlete who struggles with swim endurance?

Do you get breathless during a swim? Do tired shoulders or boredom make your sessions feel like a chore? You’re not alone!
In this guide, we’ll look at seven common swim endurance struggles and give you actionable solutions to help you power through the water.

Watch this post, or continue scrolling to read it.

Why Swimming Is the Toughest Leg for Many Triathletes

Swimming can be the most challenging part of a triathlon. From breathlessness to boredom, many factors make progress difficult. But don’t worry—we’ll break down these common problems and give you effective solutions.

#1: Breathlessness During Long Swims

Feeling breathless can lead to early fatigue and even panic, especially in open water. Here’s how to fix it:

  • Refine your breathing technique with bilateral breathing (breathing on both sides) to balance your stroke.
  • Use rhythmic breathing drills—exhale fully underwater to avoid holding your breath.
  • Practice breath control exercises like hypoxic training to increase lung capacity.

Tip: Begin each session focusing on breathing technique. Try drills like ‘breathe every three or five strokes’ to make breathing more natural.

#2: Tired Shoulders Leading to Early Fatigue

Shoulder fatigue can shorten your swim and increase injury risk. To improve endurance:

  • Use a high-elbow catch to engage your back muscles and reduce shoulder strain.
  • Incorporate strength training exercises like resistance band pulls and scapular push-ups.
  • Try a pre-swim resistance band routine to activate key muscles before getting in the water.

#3: Boredom During Long Swim Sessions

Swimming endless laps can feel monotonous, but here’s how to keep it engaging:

  • Follow a structured swim plan—don’t just make it up as you go.
  • Mix up strokes and use swim aids like kickboards or pull buoys.
  • Break sessions into smaller sets (e.g., 5x200m drills followed by 4x100m pace work).
  • Join a group swim session for motivation and social interaction.

#4: Difficulty Maintaining Proper Technique Over Distance

Fatigue can cause your technique to break down, making your swim less efficient.

  • Instead of focusing on speed, include drills like the catch-up drill and one-arm swim.
  • Increase the distance of one weekly swim session to help with endurance.
  • Focus on one technique improvement at a time to avoid feeling overwhelmed.

#5: Slow Progress in Increasing Swim Endurance

Feel like you’re not improving despite months of training? Here’s what to do:

  • Follow a structured swim plan with a balance of intensity and volume.
  • Prioritize consistency—swimming frequently is better than doing long, sporadic sessions.
  • Track your progress using a swim log or apps like Strava or TrainingPeaks.

#6: Anxiety or Discomfort in Open Water

Many triathletes struggle with open-water swims, even if they can complete the same distance in a pool. Here’s why:

  • Lack of micro-rests (compared to pool turns) and increased resistance from wetsuits.
  • Practice sighting drills and swim in busy lanes to simulate open-water conditions.
  • Gradually increase open-water swim duration to build confidence and strength.
  • Use visualization techniques and deep breathing to manage race-day anxiety.

#7: Poor Pacing Leading to Early Fatigue

Starting too fast can ruin your swim and impact the rest of your race. To improve pacing:

  • Practice swimming without relying on a watch to learn to pace yourself.
  • Use tempo trainers or train with negative splits (swimming the second half faster).
  • Incorporate interval sets (e.g., 5x200m with even splits) to improve pace control.

Final Thoughts

To recap, here are the seven common swim endurance challenges:

  1. Breathlessness During Long Swims
  2. Tired Shoulders Leading to Early Fatigue
  3. Boredom During Long Swim Sessions
  4. Difficulty Maintaining Proper Technique Over Distance
  5. Slow Progress in Increasing Swim Endurance
  6. Anxiety or Discomfort in Open Water Swimming
  7. Poor Pacing Leading to Early Fatigue

Improving your swim endurance takes time and persistence. By applying these strategies, you’ll become a stronger, more confident swimmer.

If you found this guide helpful, subscribe to our email newsletter for more triathlon training tips.

 

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Phil Mosley (Coach & Founder)
Phil Mosley (Coach & Founder)

Phil is a recognised endurance expert who founded MyProCoach in 2010 to offer smart training plans that still leave quality time for your family, friends & career - complete with highly-rated coach support (he has sold over 40,000 so far). Learn more here!

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