How to Improve Swimming Efficiency: Swim Faster with Less Effort
Quick summary: Efficiency is measured with SWOLF (time + strokes per length) and strokes per length. The 5 keys: reduce frontal drag, maximize distance per stroke, use body momentum, effective roll and economical kick. A SWOLF of 30-35 in 25m is excellent.
Swimming efficiency is defined as swimming faster with less effort. It's the factor that most separates experienced swimmers from beginners — and the good news is it can be improved at any age. While fitness has genetic limits, technical efficiency has a much higher ceiling.
How to measure efficiency
SWOLF (Swimming Golf)
SWOLF = time in seconds + number of strokes per length. The lower the SWOLF, the more efficient you are.
| Level | SWOLF (25m) | Strokes (25m) | Interpretation |
|---|---|---|---|
| Beginner | 50-60 | 22-28 | Lots of room for improvement |
| Intermediate | 40-50 | 18-22 | Good potential |
| Advanced | 32-40 | 14-18 | Efficient |
| Elite | 28-32 | 10-14 | Very efficient |
Strokes per length
Count how many strokes you need per 25m or 50m length. Reducing 1-2 strokes per length without losing speed indicates better efficiency.
5 keys to becoming more efficient
1. Reduce frontal drag
Keep horizontal body, high hips and aligned head. Every degree of inclination multiplies drag. Avoid the most common position errors. Streamlined position is responsible for 60-70% of your efficiency.
2. Maximize distance per stroke
Fully extend the arm at entry, make a deep catch with high elbow (EVF), and finish the push to the thigh. More distance per stroke = fewer strokes per length = more efficiency.
3. Use momentum
After each stroke, there's a glide moment. Don't rush to start the next stroke. "Feel" the water pass and let the body advance before pulling again.
4. Effective body roll
45-60° body rotation allows a longer stroke, reduces frontal drag and facilitates breathing. Swimming "flat" is one of the biggest efficiency killers.
5. Economical kick
An excessive kick consumes a lot of energy (legs use large muscle groups). For long distances, a 2-beat kick is more efficient. Save the 6-beat kick for sprints and speed sets.
Golden principle: Efficiency is trained when you're NOT tired. Efficiency drills should be done at the beginning of the session, after warm-up. Under fatigue, your body resorts to established patterns — not the new, more efficient ones you're trying to learn.
Drills to improve efficiency
| Drill | Objective | How to do it |
|---|---|---|
| Stroke count | Reduce strokes | Swim 25m counting strokes, repeat with 1 less at same pace |
| Catch-up | Lengthen stroke | One hand waits in front until the other reaches it |
| "Silent" | Clean entry, smooth kick | Swim trying to make no noise or splashing |
| 3-3-3 | Roll and position | 3 strokes on side, 3 normal, 3 other side |
| Sculling | Water feel | Lateral hand movements, feeling pressure |
With Swimer, every session includes technique drills to progressively improve your efficiency. Calculate your CSS and start swimming better, not just more.
Paso a paso
- Measure your SWOLF and strokes per length — Count your strokes in a 25m length and add your time in seconds. That's your SWOLF. Repeat each session to track improvements.
- Reduce frontal drag — Keep horizontal body, high hips and aligned head. Every degree of inclination multiplies drag.
- Maximize distance per stroke — Fully extend the arm, make a deep catch with high elbow (EVF) and finish the push to the thigh.
- Practice efficiency drills — Stroke count swimming, catch-up, silent swimming and sculling. Do them at the start of the session when fresh.
Preguntas frecuentes
What is SWOLF and how is it calculated?
SWOLF is the sum of the time in seconds to complete a length plus the number of strokes. For example, if you swim 25 meters in 20 seconds with 15 strokes, your SWOLF is 35. A SWOLF of 30-35 in 25 meters is considered excellent for amateur swimmers.
How many strokes per length are ideal in freestyle?
In a 25-meter pool, an efficient swimmer takes between 14 and 18 strokes per length. Fewer than 14 usually means you're gliding too much (losing speed). More than 20 indicates each stroke isn't covering enough distance. The key is finding the balance between rate and distance per stroke.
How can I swim faster without increasing effort?
The 5 keys are: reduce frontal drag (streamlined position), maximize distance per stroke (deep catch), use body momentum (effective roll), maintain an economical kick (from the hip, not the knee) and breathe without breaking body position.