Swolf Efficiency Test Swim Session

Session Overview

This 45-minute pool session teaches you to measure and improve your swimming efficiency using your swolf score — calculated by adding your stroke count per length to your time in seconds per length. A lower swolf means covering more water with less effort. Ideal for intermediate swimmers wanting to swim smarter, not just harder.

What You’ll Need

• Pool lane access (25m pool recommended)
• Waterproof GPS watch with stroke count (Garmin Forerunner, COROS, or Apple Watch)
• Notepad or phone to record swolf scores between sets
• Pull buoy (optional)

Warm-Up (8 minutes)

Swim 200m easy freestyle at a relaxed effort. Count your strokes per length but don’t try to change anything — this is your baseline measurement. Follow with 2 x 50m finger-drag drill to reinforce a high-elbow catch before the main set.

Main Set

Complete three rounds of swolf testing, deliberately manipulating stroke rate and stroke length to find your personal efficiency sweet spot. Take 30 seconds rest between each 50m rep and 90 seconds between rounds.

• Round 1 — Baseline: 4 x 50m easy effort. Count strokes per length, note your time. Calculate average swolf = (strokes + seconds per 25m).
• Round 2 — Fewer Strokes: 4 x 50m focusing on longer, gliding strokes. Aim for 2–3 fewer strokes per length than baseline. Record new swolf score.
• Round 3 — Higher Tempo: 4 x 50m with a quicker stroke rate, maintaining good technique. Note whether faster tempo improves or worsens your swolf versus Round 2.
• Benchmark Set: 2 x 100m at your best swolf technique with 30 seconds rest. Record time — this is your efficiency baseline to beat next month.

Cool-Down (5 minutes)

Swim 100m easy backstroke or breaststroke to flush the muscles. Finish with one final 50m freestyle applying your most efficient stroke from the session.

Coaching Notes

• A typical intermediate swolf in a 25m pool is 40–55. Elite open water swimmers often score 30–38.
• Gliding too long kills momentum — optimal efficiency is a balance of stroke rate and length, not just fewest strokes.
• Repeat this session monthly and track your benchmark 100m time to measure long-term efficiency gains.
• Most modern GPS watches calculate swolf automatically under swim analytics settings.
• To increase difficulty, extend the benchmark to 4 x 100m or add a 200m time trial.