Swimming Plan

AI-built swimming training plan

Q: What if I can't swim yet?

EntrenAI has a specific 'learn to swim' plan that assumes zero base. The first 4-6 sessions are floating, water breathing, horizontal posture, basic propulsion. The next 4-6 introduce front crawl with very specific drills. By week 12 you should be able to swim 200-400 m continuously. The learning program works but we recommend in-person lessons for the first 4-6 weeks too — technique corrects much faster with human visual feedback.

Q: Just front crawl or also backstroke and breaststroke?

For triathlon and most adult goals, front crawl is 90-100 % of the plan . It's the fastest, most efficient and most ergonomic stroke. Backstroke is occasionally included as 'recovery stroke' between hard sets (200 m easy back between freestyle sets). Breaststroke has completely different technique and very little transfer. We only train all 4 if you compete in multiple strokes (full swimmer, masters, etc.) — and then the plan is quite different.

Q: How much can I improve my 1500 m in 3 months?

Highly dependent on starting level. Beginner (1500 m in >35 min): 5-8 minutes improvement is realistic. Intermediate (1500 m in 25-32 min): 2-4 minutes. Advanced (1500 m in <22 min): 30-90 seconds. Improvement is non-linear: the first 4-6 weeks usually deliver the bulk of progress (large technique corrections), the next 6-8 are refinement.

Q: What if the pool is full or I have no free lane?

Technique sessions and short sets (50-100 m) are flexible: doable in a shared lane if reasonable. Long sets (300-1500 m continuous) and threshold sets with short rests need your own space. EntrenAI has a 'shared pool' version of the plan replacing long sets with shorter equivalents. If your pool is always packed, consider swimming at off-hours (6-7 AM, 9-10 PM) or switching to a less popular pool.

Q: Do I need a wetsuit for open water?

In waters <20-22°C, yes — heat loss in cold water compromises technique before cardiovascular system. In waters >24°C, wetsuits are banned in many competitions (FINA and national federations). Between 22-24°C, depends on event regulations. For training, prioritize wetsuit in cold water. The wetsuit increases buoyancy and speed 5-8 %, so train with it if you race with it.

Technique, open water or goal distance (1500 m, 800 m, 5K). EntrenAI calculates your T-pace (threshold pace), defines your zones and distributes weekly volume across technique, aerobic base and speed. Adapts to available pool and real level.

Updated September 14, 2026

4.8/5 average rating

100+ athletes

thousands of plans generated

What is an AI-built swimming training plan?

Swimming is the most technical of the three triathlon disciplines and the sport where technique beats volume. A swimmer with poor technique can train 30,000 meters per week and still be slower than one with good technique swimming 8,000 meters. The reason is physical: water is roughly 800 times denser than air and your hydrodynamic drag is proportional to velocity squared — small technique gains reduce drag dramatically.

A structured plan rests on four pillars:

Technique. Stroke-specific drills (front crawl is priority): catch-up, fingertip drag, single-arm, kick board. Technique share is high (25-30 %) for beginners, gradually drops to 10-15 % for advanced swimmers.
Aerobic base. Long sets at threshold or sub-threshold pace (60-75 % of max effort), accumulated distance per session. The "Z2 of swimming" — where the base is built.
Speed. Short sets at race pace or above, long rest, exact pace focus. For distance, the share is low (10-15 %); for 50/100 m sprinters, it climbs to 30 %.
T-pace test. The CSS test (Critical Swim Speed) replaces cycling's FTP: you swim a max 400 m and a max 200 m separately, and the formula T-pace = (T400 - T200) / 200 gives your threshold pace per 100 m. From it, all sets prescribe pace per 100 m.

EntrenAI codes those variables and applies the right model to your level: never swam? technique-priority (3 sessions/week, 1500-2500 m); already swim but want to PR your 1500 m? structured aerobic plan (4-5 sessions/week, 12,000-18,000 m); going to triathlon with open water focus? specific sessions with sighting, drafting and water entries/exits.

Four swimming plans, compared

The metres, the share of technique and where you swim all change. Pick yours and you will see its stroke or its course, its paces and its metre curve.

Plan	Weeks	km/week	Technique	Key session	Where
Beginner	8	1.6-4.5	50%	Ladder up to 400 m non-stop	Pool
Technique	8	4.5-7.5	40%	One stroke phase per week	Pool
1500 m distance	12	6-12	20%	10 × 100 at CSS	Pool
Open water	12	6-14	20%	Continuous swim with buoys	Pool + sea

How the plan works

Your AI-generated plan

1. Initial test. In the first or second session, EntrenAI asks for a CSS test:

400 m easy warm-up
400 m max (timed)
5-7 min recovery
200 m max (timed)

Then: T-pace = (T400 - T200) / 200 seconds per 100 m. If you swim 400 in 6:30 (390s) and 200 in 3:00 (180s), your T-pace = (390-180)/200 = 1.05 s/m = 1:45 per 100 m.

2. Pace zones derived from T-pace:

EN1 (Aerobic 1): T-pace + 10-15 s/100 m (comfortable base zone)
EN2 (Aerobic 2): T-pace + 5 s/100 m (worked aerobic zone)
EN3 / Threshold: exact T-pace (threshold zone)
SP1 (Speed 1): T-pace - 5 s/100 m (1500 m race pace)
SP2 (Speed 2): T-pace - 10-15 s/100 m (100 m pace)
Sprint: T-pace - 20+ s/100 m (max short efforts)

3. Distribution by level:

Beginner: 3000-5000 m/week, 3 sessions of 1500-1800 m. Split 50 % technique, 40 % aerobic, 10 % speed. Technique dominates.
Intermediate: 8000-15000 m/week, 4-5 sessions. Split 25 % technique, 60 % aerobic, 15 % speed. Long sets appear (5×400 m, 10×200 m).
Advanced: 18000-30000 m/week, 5-7 sessions. Split 15 % technique (short drills at start), 65 % aerobic, 20 % speed. Demanding sets (20×100 m at T-pace, 5×400 m at EN3).

4. Typical session structure:

Warm-up (300-600 m): easy swimming + drills
Technique block (200-800 m): specific drills
Main set (1000-3000 m): pace-based sets
Cool-down (200-400 m): easy swimming + non-primary stroke

5. Open water vs pool. If your goal is triathlon or an open water event, EntrenAI integrates specific sessions:

Sighting drills (lift your head every 6-8 strokes to orient)
Drafting practice (swim in another swimmer's wake in pool as simulation)
Water entries and exits (run into water, swim 100 m, exit, repeat)
Open water sessions scheduled when lake or sea access is available

The stroke, phase by phase

The technique plan fixes one phase a week, in this order. The orange arm is the working one; in each session the app tells you which phase to watch and with which drill.

Who is this plan for?

Four main profiles:

Absolute beginner (don't swim or drown after 50 m). 3 sessions/week, 1500-2000 m per session. Extreme focus on front crawl technique: bilateral breathing, horizontal posture, efficient stroke. Short sets (50 m with long rest) until you can swim 200 m continuous without stopping. Typical 12-week plan to swim 1000 m non-stop.
Intermediate (swim 500-1500 m non-stop but want better pace). 4-5 sessions/week, 8000-12000 m total. CSS test from week 1. Pace-based sets (5×200 m at EN2, 8×100 m at T-pace). Typical improvement: 15-25 seconds per 100 m in 12-16 weeks.
Advanced / serious triathlete. 5-6 sessions/week, 15000-25000 m. Goal-distance specific blocks (1500 m olympic, 1900 m 70.3, 3800 m Ironman). Refined technique (drills <10 % of volume), focus on pace and threshold endurance. Mandatory open water sessions.
Competitive open water. Specific plan with pool sessions simulating the conditions (no wall touches in continuous sets), sighting drills, drafting, entries/exits. Goal of a 5 km open water race? Volume rises to 18000-25000 m/week in the last 6-8 weeks before the event.

Coming from another aerobic sport (running, cycling) and want to learn to swim? EntrenAI detects it: leverages your aerobic base (you don't need many long sessions) and goes hard on technique for the first 8-12 weeks. Most runners and cyclists can learn to swim 1500 m continuous in 12-16 weeks with a structured plan.

Sample plan

Your first weeks, in detail

Week 4

Intermediate 1500 m prep — load week (T-pace 1:45/100 m)

Day	Session type	Detail	Duration
Monday	Technique + light aerobic	Warm-up 400 m freestyle + 4×50 m drills (catch-up, fingertip drag, single-arm, normal). Main: 8×100 m at EN1 (1:55/100 m) with 20s rest. Cool-down 200 m easy. Total: 1800 m.	60 min
Tuesday	Rest or cross-training	Full rest or light cross-training (45 min Z2 bike).	—
Wednesday	EN2 long sets	Warm-up 600 m (mix free and drills) + main: 5×300 m at EN2 (1:50/100 m) with 30s rest. Cool-down 200 m. Total: 2300 m.	70 min
Thursday	Technique + short speed	Warm-up 400 m + 6×50 m drills + 8×50 m at SP1 (1:40/100 m) with 30s rest + 200 m cool-down. Total: 1500 m.	55 min
Friday	Rest	Rest or 30 min yoga.	—
Saturday	Threshold set	Warm-up 600 m + main: 10×100 m at T-pace (1:45/100 m) with 20s rest + 4×50 m alternating strokes (back/breast/free/free) + 200 m cool-down. Total: 2200 m.	65 min
Sunday	Long aerobic	Warm-up 400 m + main: 1500 m continuous at EN1-EN2 (1:50-1:55/100 m, race goal pace). Cool-down 300 m mix. Total: 2200 m.	60 min

Week 8

Advanced 70.3 prep — open water + key session week (T-pace 1:30/100 m)

Day	Session type	Detail	Duration
Monday	Threshold pyramid	Warm-up 800 m + pyramid: 100-200-300-400-300-200-100 all at T-pace (1:30/100 m) with 20s rest between sets + 200 m cool-down. Total: 2400 m.	60 min
Tuesday	Technique + sighting	Warm-up 600 m + 4×100 m drills + 8×100 m with sighting every 6 strokes at EN2 (1:35/100 m) with 20s rest + 400 m cool-down. Total: 2200 m.	55 min
Wednesday	Long aerobic in pool	Warm-up 600 m + 3000 m continuous at EN2 (1:35/100 m, 70.3 goal pace) + 400 m cool-down. Total: 4000 m. Focus on holding pace constant.	85 min
Thursday	Short speed	Warm-up 800 m + 12×50 m at SP1 (equivalent 1:25/100 m) with 30s rest + 8×25 m sprint with 30s rest + 400 m cool-down. Total: 1800 m.	50 min
Friday	Rest	Full rest. Prep open water gear for Saturday.	—
Saturday	Open water session	Lake/sea access: 2500-3000 m with real buoys, sighting every 10-15 strokes, drafting if with group, 2 entries/exits (swim 800 m, exit, run 50 m, return). No access: pool simulation without walls (continuous 2500 m no stop).	70 min
Sunday	Recovery + technique	Warm-up 400 m + 12×50 m varied drills (head position and hip rotation focus) + 8×100 m at EN1 (1:40/100 m) with 30s rest + 200 m cool-down. Total: 1800 m.	50 min

These examples are real extracts from the EntrenAI planning engine. Your personal plan adjusts to your level, equipment and availability.

Equipment needed

EntrenAI automatically substitutes any exercise if you don’t have the gear.

Indoor pool access (minimum 25 m, ideally 50 m). Functional minimum: 20-25 m per length
Quality swim cap and goggles (foggy or pinching goggles ruin sessions)
Pull buoy + kickboard (for technique-specific drills)
Short fins (Finis Zoomers) — for catch and speed drills
Ergonomic paddles (Strokemakers, FINIS Agility) — intermediates and advanced only, stroke technique focus
Digital stopwatch or waterproof watch with lap counting (Garmin Swim 2, Apple Watch Ultra)
Open water: wetsuit (required in water <22°C), high-visibility cap, mirrored goggles for bright sun

Common mistakes

What most people get wrong (and how to avoid it)

1
Swimming more without improving technique
The universal adult swimmer mistake. You bump volume from 5000 to 10000 m/week and your pace improves 5 seconds per 100 m. Improve technique (catch, body position, hip rotation) and it improves 20 seconds. Technique is exponentially more efficient than volume for beginners and intermediates. EntrenAI keeps the technique share high (25 %) until your pace stabilizes consistently at T-pace.
2
Skipping CSS testing and swimming 'by feel'
Swimming by feel means swimming always at 75-80 % effort, like cyclists and runners always training in Z3. The least productive zone. The CSS test gives your exact T-pace and lets you prescribe sets by pace, not feel. Without it, EN1, EN2 and EN3 sessions blur into one zone that produces no specific adaptation. Retest every 4-6 weeks.
3
Breathing wrong or only on one side
Always breathing on the right unbalances stroke and posture. Bilateral breathing (every 3 strokes, alternating sides) produces a symmetric stroke, better open water sighting and 5-8 % energy savings. EntrenAI prescribes specific drills the first weeks to lock in bilateral breathing even if it's uncomfortable initially.
4
Short sets with short rest masquerading as 'aerobic base'
10×100 m with 10s rest isn't aerobic base — it's a disguised threshold set. For real base, sets should be 5×400 m, 4×500 m or 3×800 m with short rests (15-20s). The mistake of doing 'base' with short sets and short rests piles fatigue without developing the endurance you need for long distance.
5
Skipping technique as 'wasted time'
Technique drills like catch-up, fingertip drag or single-arm look like 'play' next to a serious 10×200 m set. But those drills train motor patterns that apply to ALL your swimming, not just the drill. Skip them and your hard-set technique doesn't improve. Keep 15-25 % of total volume on technique.
6
Not simulating event conditions (open water)
Swimming 1500 m in a comfortable pool with a wall every 25 m doesn't prepare you for 1500 m in the sea with waves, no walls, drafting and sighting. The last 6-8 weeks before the event, specific sessions: continuous swimming (no wall touches), sighting drills, water entries, drafting if with group. Without simulation, you arrive technically unarmed.
7
Ignoring shoulder fatigue
An adult swimmer without prior shoulder base can develop rotator cuff tendinitis in the first 4-8 weeks if volume ramps too fast. The rule: max 10-15 % weekly increases, deloads every 4 weeks, specific rotator cuff strengthening (1-2 short sessions/week). EntrenAI auto-includes shoulder prehab if your questionnaire flags risk (>40 years, no prior swimming, fast volume ramp).

Swimming plans by goal and level

Frequently asked questions

EntrenAI has a specific 'learn to swim' plan that assumes zero base. The first 4-6 sessions are floating, water breathing, horizontal posture, basic propulsion. The next 4-6 introduce front crawl with very specific drills. By week 12 you should be able to swim 200-400 m continuously. The learning program works but we recommend in-person lessons for the first 4-6 weeks too — technique corrects much faster with human visual feedback.

Minimum 2 sessions/week to maintain; 3 to improve (beginner range); 4-5 for serious improvement (intermediate); 5-7 for advanced/competition. Below 2 sessions/week, your specific neuromuscular adaptation (the 'feel for the water') fades fast and every pool return feels like a restart. Frequency matters more than total volume in swimming.

For beginners and intermediates, both. The optimal split is 60 % aerobic (EN1-EN2 at comfortable pace) + 25-30 % technique (drills) + 10-15 % speed (SP1-Sprint). Aerobic alone caps your ceiling; speed alone burns you out without endurance. For long distance (1500 m+, 70.3, Ironman) the aerobic share rises to 70-75 %. For 50/100 m sprinters, speed climbs to 25-30 %.

For triathlon and most adult goals, front crawl is 90-100 % of the plan. It's the fastest, most efficient and most ergonomic stroke. Backstroke is occasionally included as 'recovery stroke' between hard sets (200 m easy back between freestyle sets). Breaststroke has completely different technique and very little transfer. We only train all 4 if you compete in multiple strokes (full swimmer, masters, etc.) — and then the plan is quite different.

Four factors change: (1) no wall every 25/50 m, no rest; (2) waves, wind and/or current; (3) no lines on the bottom, you have to sight; (4) other swimmers brushing or hitting you (in races). The last 6-8 weeks before the event, EntrenAI schedules: continuous swimming sessions (1000-2500 m without touching wall), sighting every 6-10 strokes, drafting if you have a group, entries/exits. With lake or sea access, at least 2-3 specific open water sessions are mandatory.

Highly dependent on starting level. Beginner (1500 m in >35 min): 5-8 minutes improvement is realistic. Intermediate (1500 m in 25-32 min): 2-4 minutes. Advanced (1500 m in <22 min): 30-90 seconds. Improvement is non-linear: the first 4-6 weeks usually deliver the bulk of progress (large technique corrections), the next 6-8 are refinement.

Technique sessions and short sets (50-100 m) are flexible: doable in a shared lane if reasonable. Long sets (300-1500 m continuous) and threshold sets with short rests need your own space. EntrenAI has a 'shared pool' version of the plan replacing long sets with shorter equivalents. If your pool is always packed, consider swimming at off-hours (6-7 AM, 9-10 PM) or switching to a less popular pool.

In waters <20-22°C, yes — heat loss in cold water compromises technique before cardiovascular system. In waters >24°C, wetsuits are banned in many competitions (FINA and national federations). Between 22-24°C, depends on event regulations. For training, prioritize wetsuit in cold water. The wetsuit increases buoyancy and speed 5-8 %, so train with it if you race with it.