Stroke rate control means a swimmer can raise, lower, or hold their stroke rate on command, not just default to whatever rate feels natural. Most swimmers swim at one habitual rate and don’t know how to change it under fatigue. Teaching stroke rate control turns a passive habit into a tool a swimmer can use mid-race.

Female swimmer racing with AIM Systems analysis in use

Stroke rate alone doesn’t tell you much. Foundational research by Craig and Pendergast (1979) established that swimming velocity is simply stroke rate multiplied by distance per stroke. Because of that, there’s no single “correct” stroke rate — a swimmer can hit the same speed with a fast, short stroke or a slower, longer one. This is why coaches should never train stroke rate in isolation from stroke length.

Why Coaches Need to Train Stroke Rate Control Directly

Left alone, stroke rate drifts. A study by Simbaña-Escobar, Hellard, and Seifert (2018), which analyzed finalists from the 2015 World and French Championships in 50m and 100m freestyle, found that stroke rate typically drops not just lap to lap, but within a single lap. That drift isn’t automatically a flaw — the researchers frame it as swimmers adapting to fatigue and race demands. But an untrained swimmer drifts by accident. A trained one drifts on purpose, or holds steady on purpose, because they chose to.

That distinction is the whole point of stroke rate control work. You’re not chasing a fixed number. You’re building the swimmer’s ability to feel a rate, name it, and reproduce it under load.

Drills That Build the Skill

Try these in-season, not just during technique blocks:

  • Broken-rate sets: swim 4×50 where each 50 is done at a different self-selected rate — “easy,” “race pace,” “sprint,” “controlled.” Ask the swimmer to predict their own rate before checking the data.
  • Hold-the-rate 100s: pick one rate for all four laps and see how much it drifts. This directly tests the fatigue effect described in the 2018 research.
  • Rate-and-length trade-off sets: same pace, different rate/length combinations, so swimmers feel that velocity has two knobs, not one.

The coaching approach associated with Bill Boomer is useful context here. His “Posture, Line and Balance” methodology treats body alignment and balance in the water as the foundation stroke mechanics sit on top of, rather than coaching stroke rate as an isolated arm-speed number. A swimmer with poor balance often can’t hold a rate steady even if they understand the concept — the rate falls apart because the platform underneath it is unstable.

Where the Data Comes In

The hard part of stroke rate control isn’t explaining it — it’s proving it happened. Eyeballing stroke rate from the pool deck is unreliable, especially across a full race.

AIM Systems’ fixed camera installation tracks stroke rate continuously through an entire swim, with every individual stroke marked on the graph. That means a coach can pull up a 100m freestyle after practice and see exactly where the rate held steady and where it dropped — lap by lap, even stroke by stroke. Paired with lap time and dropoff data, a coach can see whether a rate drop actually cost speed, or whether the swimmer compensated with a longer stroke, just as the 1979 velocity formula predicts.

That swim can also be compared directly against the swimmer’s own past best times, which turns “hold your rate” from a vague instruction into a measurable target session over session.

If you want to see how this looks with your own swimmers’ data, get in touch with AIM Systems — no pressure, just a look at what’s possible.

Frequently asked questions

What is stroke rate control in swimming?
It’s a swimmer’s trained ability to deliberately raise, lower, or hold their stroke rate rather than swimming at whatever rate feels automatic.

Is a higher stroke rate always better?
No — research by Craig and Pendergast (1979) showed velocity equals stroke rate multiplied by distance per stroke, so the same speed can come from different rate-and-length combinations.

Does stroke rate naturally drop during a race?
Yes, a 2018 study of World and French Championship finalists found stroke rate commonly decreases within a single lap and across a race, often as an adaptation to fatigue rather than a technical error.

Sources

  • Craig, A.B., & Pendergast, D.R. (1979). Relationships of stroke rate, distance per stroke, and velocity in competitive swimming. Medicine and Science in Sports, 11(3), 278-283. https://doi.org/10.1249/00005768-197901130-00011
  • Simbaña-Escobar, D., Hellard, P., & Seifert, L. (2018). Modelling stroking parameters in competitive sprint swimming: Understanding inter- and intra-lap variability to assess pacing management. Human Movement Science, 61, 219-230. https://doi.org/10.1016/j.humov.2018.08.002

Coaching Perspectives Referenced