Structured Swim Training for Runners Who End Up in the Pool

Most runners don’t choose swimming. They get sent there.

A calf strain, a stress reaction, a niggling Achilles, or just an off-season week too many, and suddenly the pool is the only place a runner can maintain aerobic fitness. The engine is there (a runner who can hold threshold for 40 minutes has plenty of cardiovascular fitness to spend), but on entering the water, none of it transfers cleanly. Breathing dies past 50 metres, the legs sink, and the lane clock is the only feedback available. There is no plan, no structure, and no idea whether this counts as training or just splashing.

Max Klackl built AquaPlan for exactly that gap. It is a swim-training app that gives runners a real, periodised plan and lets them send structured sessions to their Garmin, without needing a coach on deck to tell them what to do. What follows is a short, factual walkthrough of what it does and where it fits for the running and triathlon crowd who dip into the water.

How AquaPlan works

TL;DR: The user sets a goal, AquaPlan builds a multi-week swim block with coach-style guidance and per-session structure, and each workout can be pushed straight to a Garmin watch.

Setup asks four things: the goal (endurance, pace control, technique, or race readiness), how many weeks are available, how many sessions a week the user can commit to, and the target peak session distance. From that, AquaPlan generates a periodised block: a build phase that ramps up volume, followed by a taper if there is a race date on the calendar.

Every session comes broken into blocks: warm-up, drills, a main set, and rest intervals, each tagged with a training zone. Alongside the numbers come plain-language coaching notes: why this session exists, what the phase is doing, and whether progress is on track. The result is structure and rationale, not just a wall of distances.

Max is straight about one thing that matters to a technical audience: the plan generator is rule-based periodisation, not a machine-learning “adaptive” engine. It applies proven build-and-taper templates to user inputs and race date. It does not silently rewrite next week off logged swims. The user stays in control, and any individual session can be re-rolled. Max prefers to describe it honestly rather than oversell it as an AI coach it isn’t.

A worked example: the sidelined 10k runner

Take a runner who can comfortably run 10k, and a calf strain that has just cost three weeks of running. The goal is to hold fitness and, ideally, come back a more complete athlete. Here is what an 8-week AquaPlan endurance block actually looks like for that runner:

• Plan: 8-week endurance block, 3 sessions per week, 2,000 m peak session distance, 25 m pool.
• Week 1, session 1: 400 m warm-up in GA1 (easy aerobic), 4×50 m technique drills, a 6×100 m main set in GA1 to GA2 with rest intervals, and a 200 m cool-down. Total around 1,400 m.
• Progression: volume ramps from roughly 0.6 to 1.0 across the build weeks, so by week 6, that same session structure carries the runner near the 2,000 m peak.
• What to watch: AquaPlan tracks pace per 100 m, distance, SWOLF, and a training-load estimate for every swim that syncs back. For a runner, SWOLF is the number to befriend. It is strokes plus time per length, so it rewards going faster and more efficiently, which is exactly the technique gap most runners have.

The value is walking on deck knowing precisely what to swim, in which zone, and why, instead of grinding 40 aimless lengths and calling it cross-training.

Free, Premium and Coach

Three tiers:

• Free: build and save swim workouts (3 saves a week, up to 5 saved plans), 30 days of history, the full builder, and free access to the SWOLF, pace and interval calculators. Sharing a workout by link is free on purpose.
• Premium (€9/mo or €90/yr): unlimited plans and builder use, full training history, PDF export, and the export features below (FIT-file export and sending structured workouts to Garmin).
• Coach (€19/mo or €190/yr): everything in Premium plus workout import (paste, photograph or upload a PDF of a session and have it parsed into editable builder blocks) and a Garmin activity editor for correcting miscounted lengths on a synced swim.

Integrations and compatibility

AquaPlan is Garmin-compatible workout-planning software, not an official Garmin product. Here is what actually connects:

• Garmin: import swim activities from Garmin Connect, and send workouts the other way, either as a Garmin-compatible FIT file imported into Connect, or pushed as a structured, scheduled workout onto the calendar day.
• Strava: two-way. Import activities and upload a completed AquaPlan workout back to Strava.

Things to note

• The plan engine is deterministic periodisation, as covered above. It is great for structure, but it will not automatically adjust load based on your performance.
• The only feature that uses an AI model is Coach-tier workout import (parsing free-text or photo/PDF sessions). Everything else is computed, not generated.
• AquaPlan is live on iOS (App Store), Google Play Store, and on the web at aquaplan.fit.
• It is built around pool swimming with training zones and structured sets. For swimmers who only ever open-water swim by feel, a structured plan is less relevant.

Summary

For runners and triathletes who end up in the pool, whether by injury, off-season, or building toward a first triathlon swim, AquaPlan turns “I have to swim now” into an actual plan. It provides a periodised block, session-by-session structure with coaching rationale, the metrics that show whether the technique is improving (pace and SWOLF), and the ability to send the workout to the watch already in use. It does not pretend to replace a swim coach’s eyes on the stroke. It replaces the far more common problem: showing up to the pool with fitness to spend and no idea how to spend it.

Max writes more about the runner-to-pool crossover here: Swimming vs Running: what actually transfers, and where cross-training helps.

Quick answers

Do I need a Garmin to use AquaPlan?
No. Plans, structured sessions and the calculators all work without any watch. A Garmin (or Strava) just lets swims sync in, and workouts push to the watch, and those export features are on the paid tiers.

Is it useful for a runner who can barely swim?
Yes, that is a core case. The technique and endurance goals start at beginner-friendly volumes, and SWOLF tracking is specifically the metric that tells a fitness-rich, technique-poor swimmer whether they are actually getting more efficient.

How is this different from a generic training-plan PDF?
The plan is generated from the user’s own goal, weeks, sessions and race date, with zone-tagged sets and coaching notes, and it is not static. Any session can be re-rolled, blocks edited, and the workout sent to the watch instead of reading a PDF on the pool deck.

Related reading on the5krunner

• FORM Smart Swim 2 LT Review: live swim metrics in the goggles’ field of view, at the lowest price the platform has carried.
• Amazfit Balance 3 Swimming Accuracy: HR, Laps, and FORM. Smart Swim Goggles Coaching: pool swim testing on the Balance 3, with the FORM goggles as the coaching layer.
• IntervalCoach: AI Training That Adapts to Your Recovery Each Day: another indie training app that treats swimming as one of the sports in a multi-sport plan.

Author: Max Klackl, developer of AquaPlan, edited by the5krunner.

If you enjoyed reading this, here is another in the Indie Spotlight series: Negative Split: Free Local Strava Running Analytics.

Last Updated on 12 October 2026 by tfk the5krunner

tfk the5krunner

tfk is the founder and author of the5krunner, an independent endurance sports technology publication. With 20 years of hands-on testing of GPS watches and wearables, and competing in triathlons at an international age-group level, tfk provides in-depth expert analysis of fitness technology for serious athletes and endurance sport competitors. ID