Rebuilding Swim Technique: Where Adult Triathletes Rediscover Their Feel for the Water

Adult Swimming: The Problem Is Almost Always Technique

Being strong at running and cycling yet slow in the water is the most common pain point for triathletes. The cause isn’t insufficient cardio—it’s excessive drag in the water and poor propulsion efficiency. Swimming offers the highest “return on technique investment” of any triathlon discipline.

Three Major Efficiency Bottlenecks

Focus on Drag, Not Propulsion

A beginner’s instinct is to “pull harder,” but drag in water is proportional to the square of speed. Flattening your body position and reducing drag first often yields faster results than adding more power.

Key Practice Prescriptions

• Body position: Kickboard/side-kick drills to train a horizontal body line
• Catch: Catch drills to feel the high elbow
• Tempo: Use a tempo trainer to control stroke rate; prioritize distance per stroke before speed
• Open water: One weekly long swim without walls to break the “rest on the wall” dependency

Quantifying Progress

Use “strokes per 25m (SWOLF)” to track efficiency: a drop in stroke count at the same pace means your technique is genuinely improving—more reliable than looking at time alone.

Mindset

Early in a technique rebuild, you’ll often get slower. That’s the normal “break it down before building it up” phase. Give yourself 8–12 weeks; don’t quit in week three and fall back into old habits.

Use SWOLF to Turn “Feel for the Water” into a Trackable Number

What adult triathletes lack most isn’t cardio but efficiency, and the most practical metric for efficiency is SWOLF (seconds per lap + stroke count for that lap). For example, swimming 25m in 22 seconds with 18 strokes gives a SWOLF of 40. The real sign that a technique rebuild is working is “SWOLF dropping at the same pace”—fewer strokes means more distance per stroke, which distinguishes “genuine improvement” from “just trying harder” better than time alone.

Quantified Improvement Paths for the Three Major Efficiency Bottlenecks

Common Mistake: Giving Up in Week Three of a Technique Rebuild and Reverting to Old Habits

When rebuilding technique by focusing on drag reduction, you will almost certainly “get slower” at first—that’s a normal part of rebuilding movement patterns. Yet most people panic in weeks 2–3 when their pace worsens and revert to their old brute-force swimming style, throwing away all their progress. The right answer is to give yourself an 8–12 week “break it down before building it up” window, judging progress by SWOLF rather than time alone; once your stroke count starts dropping, speed recovery is only a matter of time.

I’ve coached countless triathletes who were strong at riding and running but couldn’t swim fast. The breakthrough almost never came from training harder—it came the day they finally stopped using brute force and started making their body “slippery.” Speed in swimming comes from reducing drag, not from applying more force.

Related Reading

• Triathlon Swimming Technique Refinement: Five Key Keys to Freestyle Efficiency
• Triathlon Swimming Pace Strategy: A Controlled Stroke to Save Energy
• Triathlon Swim Exit and T1 Transition Speed Optimization: The Critical 120 Seconds from Water to Bike
• Intermediate Swimmers Breaking Through Plateaus: Training Strategies to Progress from 1000m to 2000m