Long-distance swimming tests your physical and mental endurance to the limit. But by building a strong foundation, you’ll be well-equipped to achieve your goals. This guide will provide practical tips and strategies to help you prepare for the rigors of long-distance swimming. Whether you’re training for a race, tackling a personal milestone, or exploring the UK’s stunning open-water swim spots, these tips will build your confidence and help you perform at your peak.

1.      Build a Strong Training Foundation.

Endurance is built over time through regular, structured training sessions. Aim for three to five swimming sessions a week, gradually increasing your time and distance in the water. Consistency helps condition your body to sustain longer swims while improving your efficiency and technique.

Gradually increase your training volume to avoid injury and burnout. A good rule of thumb is the 10% rule—don’t increase your weekly distance by more than 10%. This allows your muscles, joints, and cardiovascular system to adapt to the increasing workload and helps prevent burnout.

Interval sets are a great way to improve aerobic capacity and overall endurance. For example:

8 x 400m with 30 seconds rest at a steady pace.
10 x 100m with 15 seconds rest, alternating between a moderate and fast pace.
 

Mixing steady long swims with interval training builds speed and endurance, helping you maintain a strong pace over long distances. It also keeps your swimming sessions varied and interesting.

2. Perfect Your Technique.

Swimming efficiently is essential for long-distance events. Poor technique wastes energy and limits your endurance. Focus on the following to hone your technique:

·         Check your streamlining: Keep your body horizontal in the water to minimize drag.

·         Improve Your Stroke: Work on a balanced, efficient freestyle stroke. Ensure your pull is powerful and your kick is rhythmic but not overexerted.

·         Bilateral Breathing: Breathing on both sides improves symmetry and helps you adapt to varying open-water conditions.

To get the best results, consider working with a coach. Regular feedback from a coach or video analysis can identify inefficiencies in your stroke and help keep you motivated as you work on your technique and fitness.

3. Train in Open Water.

Long-distance swimming often takes place in lakes, rivers, or the sea, where conditions differ significantly from a pool. Practice in open water regularly to adapt to the conditions. This will help to build confidence in currents, waves, and varying water temperatures. It will also improve your navigation skills by sighting landmarks or buoys and help you get used to swimming without lane lines or walls for rest.

For UK swimmers, cold water is a common challenge. Gradually expose yourself to colder temperatures, starting with short swims and increasing the duration as your body adapts. Wearing a well-fitting wetsuit or silver-lined swimwear can also help you stay warm during longer swims. 

For a fun way to build your open-water confidence and skills, try scuba diving. As a diver, you learn skills that will build your comfort in open water, such as in-water navigation, body positioning and trim, breath control, and how to adapt to dynamic open-water environments. Best of all, you get to explore beautiful underwater environments while you learn. 

4. Cross-Train for Strength and Flexibility.

Incorporate exercises that build your core, shoulders, and back muscles to improve your swimming power and reduce the risk of injury. Focus on movements like:

Planks and side planks for core stability.
Pull-ups and lat pulldowns for upper-body strength.
Squats and lunges to support a strong kick.
 

Stretching and mobility work will enhance your range of motion, leading to more efficient swimming. Consider adding yoga or Pilates to your routine to improve flexibility and recovery. Before starting any new fitness routine, check with your physician first, especially if you have any pre-existing medical conditions.

5. Fuel Your Body for Endurance.

Fuelling your body is an important aspect of training that often gets overlooked in our busy lives. Carbohydrate-rich meals before long swims provide the energy needed to sustain effort. Include whole grains, fruits, and vegetables in your diet.

For swims lasting over an hour, practice taking in small amounts of nutrition, such as sports drinks, gels, or energy bars. Experiment during training to determine what works best for your body and don’t try anything new on the day of your event.

Staying hydrated is also important and easy to forget when you’re in the water. Drink regularly during training and events. If swimming in saltwater, consider electrolyte-rich drinks to replenish lost minerals.

6. Train for Specific Goals.

Mimic the conditions of your event during training. If you’re preparing for a lake swim, practice in similar water (always check the local water quality first). If your event involves multiple laps, simulate the repetition in training.

Set realistic, measurable goals to track your progress as you train, and keep a note of these in your journal. For example:

Increase your 5km swim time by two minutes within three months.
 

Complete a continuous 2-hour swim at a steady pace.
 

And remember to taper off before your event. Reduce your training volume in the two weeks before an event to allow your body to recover and perform at its peak.

7. Build Mental Stamina.

Endurance swimming requires as much mental toughness as physical fitness. Popular strategies for building mental resilience include:

·         Visualizations.

Before every training session or event, spend time visualizing yourself swimming the full distance. Imagine overcoming challenges and crossing the finish line. Visualization helps reduce anxiety and boost confidence.

·         Mindfulness.

Stay present during your swims by focusing on your stroke, breathing, and surroundings. If your mind wanders or doubts creep in, bring your attention back to the rhythm of your swim. 

Instead of thinking about the total distance, divide your swim into smaller segments. Focus on completing one section at a time, whether it’s the next buoy, lap, or 10-minute interval. Replace negative thoughts with affirmations like “I am strong” or “I can do this.” Repeating positive mantras can keep you motivated during tough moments.

To develop your mental resilience further, consider booking a freediving session at your local dive centre. Freediving is an excellent complementary sport for swimmers as it helps enhance mental focus, builds lung capacity, and improves breath control - valuable skills for long-distance swimming.

8. Prioritize Your Recovery.

Rest is when your body rebuilds and strengthens itself after training. Ensure you get plenty of sleep and stretch or foam roll after swim sessions to prevent stiffness. Also, schedule rest days to avoid overtraining and help prevent injuries.

9. Get The Right Gear.

The right equipment can make a significant difference in your training and performance. Invest in a high-quality wetsuit designed for open-water swimming. Choose goggles with anti-fog and UV protection. Tinted or polarized goggles are useful for sunny conditions.

Use a safety buoy for visibility and safety during open-water swims and apply anti-chafing balm to avoid irritation during long swims. If you are cold-water swimming, take warm clothing, a fleece-lined changing robe, and a hot drink to warm up afterward, and don’t swim alone.

10. Join a Community.

Training with others can keep you motivated and accountable. Consider joining a local swimming club or open-water group. The camaraderie of fellow swimmers can make training more enjoyable and provide valuable tips for improving your endurance. 

Kathryn Curzon, a shark conservationist and dive travel writer for SSI (Scuba Schools International), wrote this article.