Freestyle Kicking vs. Catch: Optimizing Energy Distribution for a 1500m Triathlon Swim

Why Triathlon Swimming Should Save Your Legs

The 1500m swim in a triathlon only accounts for 10% of total time, but excessive kicking will fatigue the quadriceps and calf muscles, affecting subsequent cycling and running performance. Research:

• Pure swimmers: Kicking contributes 25-30% of propulsion
• Triathletes: Kicking contribution should be controlled at 10-15%

The Mechanics of the Catch (Pull)

The catch phase is divided into 4 stages:

1. Hand Entry: Fingertips enter the water first, followed by the forearm
2. Catch: Wrist presses down, forearm perpendicular to the bottom
3. Pull: High elbow position (EVF, Early Vertical Forearm) pulls down to the thigh
4. Exit: Pinky exits first, shoulder blades retract

The EVF technique can increase pull propulsion by 25% while reducing stress on the shoulder joint.

Comparison of 4 Kicking Rhythms

Buoyancy Test: How Much Kicking Do You Need

Test Method

1. Put on a one-piece swimsuit (wetsuit also works)
2. Float completely relaxed (face down on the water), arms extended forward
3. Observe your body angle

Reading the Results

• Top of head and heels at the same level: Naturally buoyant, can use a 2-beat kick
• Heels sink within 30 degrees: Can alternate between 2-beat and 4-beat
• Heels sink more than 30 degrees: Need a 4-6 beat kick to maintain body balance

70.3 Triathlon 1900m Pacing Strategy

Phase 1: Start 0-200m

• Sprint to break away from the pack
• 6-beat kick, pace 1:30/100m
• Heart rate spikes to 165 bpm

Phase 2: Find Your Rhythm 200-500m

• Switch to a 4-beat kick
• Slow pace to 1:45/100m
• Heart rate settles to 150-155 bpm

Phase 3: Cruise 500-1500m

• Switch to a 2-beat kick
• Pace 1:50-2:00/100m
• Heart rate 145-150 bpm
• Use wetsuit buoyancy to save 10-15% energy

Phase 4: Final Sprint 1500-1900m

• Switch back to a 4-beat kick
• Pace returns to 1:45/100m
• Begin waking up the leg muscles, preparing to exit the water

3 Key Drills for Catch Technique

Drill 1: Fingertip Paddling

Swim 50m × 4 sets using only your fingertips, forcing yourself to feel the water resistance and the catch point.

Drill 2: Catch-Up

Each stroke returns to the front and touches the other hand before starting the next stroke, reinforcing single-arm catch stability.

Drill 3: Pull Buoy Drill

Place a pull buoy between your legs and swim 200m × 6 sets using only your arms, developing pure catch propulsion.

3 Adaptations for Open Water

1. Sighting: Every 6-8 strokes, lift your head once to check the buoy direction
2. Wave Rhythm: Breathe at the wave crest, pull during the trough
3. Drafting in a Pack: Find someone 10% faster than you and stay 50cm behind them to save 20-30% energy

Conclusion

The core of triathlon swimming is “pull with your arms, kick to maintain balance.” Over a 1500m distance, a 2-4 beat kick combined with EVF catch technique will allow you to exit the water with your heart rate below 150 bpm, so you won’t be too breathless to speak during the first kilometer of the bike leg after T1.

Related Reading

• The Science of Freestyle Kicking: How to Choose Between 2-Beat, 4-Beat, and 6-Beat? Leg-Saving Strategies for Long-Distance Swimming and Triathlon
• Turn and Kick Rhythm in the Triathlon Swim Leg: Energy Distribution for 1500m Open Water
• Freestyle Kick Rhythm 2-beat, 4-beat, 6-beat: Which One Should Triathletes Choose?
• Freestyle Stroke Rhythm: Best Use Cases and Training Strategies for 2-Beat, 4-Beat, and 6-Beat Kicking