Swimming Cool-down: The Recovery Value of a 400m Easy Swim After the Main Set

Why You Need a Cool-down

After high-intensity training, the body is in a state of:

• Lactate accumulation: acidic environment in the muscles
• Elevated heart rate: 80-90% of maximum heart rate
• Blood pooled in muscles: difficulty with venous return
• Elevated core temperature: in the process of cooling down
• Nervous system excitation: sympathetic nervous system dominance

Suddenly stopping exercise can cause:

• Delayed lactate metabolism
• Blood pooling in the lower limbs
• Dizziness and lightheadedness
• Increased next-day muscle soreness (DOMS)
• A sudden shift in cardiovascular stress

The cool-down is the bridge that allows the body to transition in an orderly way from high activity back to a recovery state.

The Physiological Significance of the Cool-down

1. Accelerates Lactate Metabolism

Sustained low-intensity activity can:

• Maintain blood circulation to remove lactate
• Speed up lactate oxidation within the muscles
• Reduce lactate by 60% within 30 minutes after high-intensity effort

2. Prevents Blood Pooling

The lower limb muscles are an important “venous pump”:

• During training, muscle contractions help blood return to the heart
• Sudden cessation → blood pools in the lower limbs
• Can easily cause postural hypotension

3. Gradually Lowers Core Temperature

• Body temperature can reach 38.5°C after training
• The cool-down allows core temperature to drop slowly
• Avoids getting chilled after leaving the pool

4. Nervous System Transition

• Shifts from sympathetic (active) to parasympathetic (rest) dominance
• Reduces post-training anxiety
• Improves sleep quality

5. Psychological Recovery

• Processes the day’s training experience
• Stabilises mood
• Boosts motivation for the next day’s session

The Complete Cool-down Protocol

Phase 1: In-Water Cool-down 400-600m (10-15 minutes)

Segment 1: 200m Freestyle + Backstroke Alternation

• Alternate 50m freestyle + 50m backstroke
• Pace: T-pace + 30-40 seconds per 100m
• Heart rate: 60-70%, gradually dropping to 55-65%
• Breathing: bilateral, breathing every 3 strokes
• Focus: completely relaxed, no timing, no pace chasing

Segment 2: 100m Breaststroke or Backstroke

• Slow breaststroke or backstroke
• Pace: very easy
• Focus: relax the shoulders, thoracic spine, and lower back
• Breaststroke is especially helpful for opening the hips and stretching the pectorals

Segment 3: 100m Kickboard

• Backstroke kicking with a board
• Pace: slow
• Focus: relax the legs, mobilise the ankle joints
• The supine position helps venous return from the lower limbs

Phase 2: Static Stretching at Poolside (5-10 minutes)

The body still retains residual heat after the cool-down, making this the ideal time for static stretching.

1. Shoulder and Chest Stretch

• Clasp hands behind the back
• Slowly raise the arms
• Hold for 30 seconds
• Repeat 3 times

2. Rotator Cuff Stretch

• Bring one arm across the chest
• Use the other hand to pull the elbow toward the chest
• Hold for 30 seconds
• 3 times per side

3. Triceps Stretch

• Raise one arm overhead and bend the elbow
• Use the other hand to pull the elbow toward the opposite side
• Hold for 30 seconds
• 3 times per side

4. Pectoral Stretch

• Place the arm against a wall at 90 degrees
• Rotate the body in the opposite direction
• Hold for 30 seconds
• 3 times per side

5. Latissimus Dorsi Stretch

• Grip something high (wall, bar) with both hands
• Sit the hips low and let the body sink
• Hold for 30 seconds
• Repeat 3 times

6. Calf Stretch

• In a lunge position, keep the rear heel flat on the ground
• Hold for 30 seconds
• 3 times per side

7. Hamstring Stretch

• Seated, extend one leg straight and fold forward
• Hold for 30 seconds
• 3 times per side

8. Quadriceps Stretch

• Standing, grab the ankle with one hand and pull it toward the glutes
• Hold for 30 seconds
• 3 times per side

9. Hip Flexor Stretch

• In a lunge position, drop the rear knee to the ground
• Push the pelvis forward
• Hold for 30 seconds
• 3 times per side

Phase 3: Recovery Actions Within 30 Minutes After Leaving the Pool

1. Rehydrate Immediately (within 5 minutes of exiting the pool)

• 500ml of an electrolyte drink
• Avoid ice-cold drinks
• Drink slowly

2. Refuel (the 30-minute golden window)

• 20-30g protein (for muscle recovery)
• 60-90g carbohydrates (to replenish glycogen)
• A ratio of roughly 1:3

Suggested foods:

• Protein shake + banana
• Chicken sandwich
• Tuna rice ball + soy milk
• Greek yoghurt + honey + nuts

3. Rinse and Shower

• Rinse with warm water (avoid hot water)
• Clean off the chlorine thoroughly
• Gently massage the muscles while rinsing

4. Change Clothes and Stay Warm

• Change into dry clothes immediately
• Avoid cold drafts
• In winter, add a scarf to keep the neck warm

Adjusting the Cool-down for Different Training Types

After High-Intensity Interval Training

• Extend the cool-down to 600-800m
• Lactate accumulation is most severe and needs longer to metabolise
• Static stretching can be extended to 15 minutes

After Long-Distance Aerobic Work

• A 400m cool-down is sufficient
• Focus on stretching
• Refuelling is more important

After a Technique Session

• A 200m cool-down is enough
• The main set wasn’t very taxing anyway
• Keep stretching brief

After a Race

• The cool-down is especially important after racing
• At least 600m
• Prevents severe soreness the next day
• Affects performance in subsequent races

Common Cool-down Mistakes

Mistake 1: Leaving the Pool Immediately

The most common mistake. Reasons:

• The training session was already long
• Want to get home quickly
• Think “it’s not necessary”

Consequences:

• Severe soreness the next day
• Affects the quality of the next training session
• Unnecessary cardiovascular strain

Mistake 2: Cool-down Intensity Too High

• Heart rate should not exceed 60-70%
• Should not feel “tired”
• It is not “a few more sets”

Mistake 3: Overdoing Static Stretching

• Stretch only to mild tension
• It should not hurt
• No ballistic bouncing
• Enter and exit the stretch slowly

Mistake 4: Cold or Hot Water Immediately After the Cool-down

• Do not jump into an ice bath immediately
• Do not take a hot bath immediately
• Change temperature gradually

Advanced Recovery Strategies

After completing the cool-down, amateur to competitive swimmers can add:

1. Cold Water Immersion (10-15°C, 10-15 minutes)

• After high-intensity training
• Reduces muscle inflammation
• But do not use daily (it can suppress muscle adaptation)
• 2-3 times per week is sufficient

2. Foam Rolling (10-15 minutes)

• Front and back of the thighs
• Latissimus dorsi
• Calves
• Roll slowly, pausing on tender points

3. Compression Socks

• Wear for 2-4 hours after training
• Promotes venous return from the lower limbs
• Especially effective after long-distance work

4. Active Recovery Day

• Do low-intensity activity the next day
• A 30-minute easy swim or a walk
• More effective for recovery than complete rest

The Long-Term Impact of the Cool-down on Training Performance

Research shows that swimmers who consistently perform a cool-down:

• Experience 30-40% less DOMS the next day
• Maintain consistent performance on consecutive high-intensity days
• Have a 20-25% lower injury rate
• Maintain better training motivation
• Progress faster in the long run

Cool-down Needs for Children

Young swimmers:

• Still need a cool-down, but it can be shortened
• 200-300m is sufficient
• Don’t force static stretching
• Focus on building the habit

Conclusion: The Cool-down Is Part of Training

Amateur swimmers are the most likely to skip the cool-down, yet it is the key that separates long-term progress from short-term burnout.

The next time your main set ends, don’t leave the pool immediately. Swim another 400m, stretch for another 10 minutes—this 20-minute investment pays back in next-day training quality and years of training longevity.

Related Reading

• Swimming Warm-up 400m Standard Protocol: The Essential Ritual Before Every Session
• Swimming Cool-down and Recovery Sets: The Unmissable Recovery Component After Training
• Warm-up and Cool-down for Swimmers: The Pre- and Post-Session Protocol to Maximise Training Results
• Cooling Down After Speed Work: A Recovery Protocol of Static Stretching and a 10-Minute Jog