Battery test #1 of two. From a single timed swim, get your distance per stroke, stroke rate, and a height-relative DPS rating. The Yousuli verdict tells you whether to focus on increasing rate or improving DPS, the cleanest single signal for swim training direction.
Swim a measured distance at steady effort, count strokes (or know your SR), and time it. If you only have one of SR / total strokes, leave the other blank, we’ll compute it.
Speed = SR × DPS. To swim faster, raise one without dropping the other.
How far each pull moves you. Bigger people can have bigger DPS, that’s why we anchor to height. DPS / height between 60% and 65% is the balanced range for most well-trained swimmers.
How many pulls per minute. Faster swimming generally needs higher SR, but only if DPS doesn’t collapse. The Yousuli SR table sets acceptable SR ranges by pace bracket.
If your SR is below the acceptable range for your pace → Increase SR. If above → Increase DPS (you’re thrashing). If inside → Balanced, you’re using the right combination for that speed.
Re-test every 4–6 weeks at the same distance, same pool, same time of day. Single-time numbers are noisy; trends matter. Pair this with EBT-2 (tipping points) for a fuller picture, that test finds the speed where DPS collapses, which tells you exactly when to switch from glide to grind.
Where each band sits as a % of height, and what it means.
You’re putting in many strokes for the distance. Almost certainly a technique fix, body position, catch, pull path. Drill-heavy block.
Improvable. DPS work pays. Most adult-onset swimmers sit here when they start. 4–8 weeks of focused technique typically moves you up a band.
Where most well-trained age-groupers live. From here, gains come from raising both SR and DPS together, not one in isolation.
Strong technique, long pull. Watch for over-gliding, if SR is dropping below your pace bracket, you’re leaving speed on the table.
Elite territory or extreme glide. If race pace is slow despite huge DPS, you’re under-using SR. Add tempo work.
Pairs naturally with this, finds the speed where your DPS collapses.
Open → Critical swim speed (CSS)Pace zones for swim training based on a 2-effort threshold test.
Open → All calculatorsBack to the full catalog, 30+ endurance calculators across performance, fueling, swim, bike, run.
Browse →On-site swim coaching pairs the EBT data with high-speed video and a Slipstream stationary-swim setup, we identify the technique limiter behind your number, not just the number itself.
Spotted a bug or want a feature? Email info@yousuli.co.
