AI-built sprint triathlon plan
12-14 weeks, 6-9 hours/week. 750 m swim + 20 km bike + 5 km run. EntrenAI validates your prior base (400 m continuous swim mandatory), structures all three disciplines with specific bricks and applies precise peaking for your race date.
Updated
What is a sprint triathlon plan?
Sprint triathlon (750 m swim + 20 km bike + 5 km run, 25.75 km total) is the entry format to triathlon. Amateur target time: 1:00-1:30 h. Short enough to train intensely without excessive fatigue, long enough that all three disciplines + transitions decide the result.
The three disciplines demand different adaptations:
- Swimming (~10-15 min): technique-dominant, but also aerobic capacity. Poor technique costs 5-10+ minutes in the race.
- Cycling (~30-45 min): the longest discipline. Controlled pacing and efficient bike position.
- Running (~22-30 min): running fatigued after pedaling is very different from running fresh. Brick training is decisive here.
The plan integrates all three with specific sessions + bricks (consecutive bike-run) that train the T2 transition, the most physically demanding.
Sprint (750 m · 20 km · 5 km): how long each leg takes by level
The app estimates your total time from your real paces in each discipline and how long you take in transitions, and splits the plan's hours with it: the discipline where you lose most time is the one that trains most.
| Level | Swim | T1 | Bike | T2 | Run | Total |
|---|---|---|---|---|---|---|
| Finish2:30/100 m · 25 km/h · 6:00/km | 18:45 | 3:00 | 48:00 | 2:00 | 30:00 | 1:41:45 |
| Intermediate2:00/100 m · 30 km/h · 5:15/km | 15:00 | 2:00 | 40:00 | 1:30 | 26:15 | 1:24:45 |
| Fast1:40/100 m · 35 km/h · 4:30/km | 12:30 | 1:30 | 34:17 | 1:00 | 22:30 | 1:11:47 |
- Swim
- Bike
- Run
- Transitions
Your AI-generated plan
1. MANDATORY safety prerequisite check. EntrenAI requires before starting:
- 400 m continuous swim in pool (no stops, any technique). This validates you can do the 750 m of the event without risk.
- Capacity to pedal 30 km comfortably in a single ride
- 5 km running comfortable under 35 minutes
- Pool access (25/50 m) at least 2×/week
Can't do 400 m continuously? The plan requires 6-8 weeks of pure swimming first before starting the triathlon plan. The reason is safety: 66 % of triathlon deaths occur during the swim, almost all from panic / insufficient technical capacity when transitioning to open water. EntrenAI does not compromise this.
2. Typical weekly structure (7 sessions, intermediate):
- Monday: Technical swim (45-60 min, drills + 1,500-2,500 m total)
- Tuesday: Bike sweet spot intervals (60-75 min)
- Wednesday: Easy run + strides (45 min)
- Thursday: Aerobic swim (1,500-2,500 m total with long sets)
- Friday: Brick (bike 45-60 min + run 15-20 min Z2-Z3)
- Saturday: Long ride 60-90 min Z2 + optional short run after (brick)
- Sunday: Long run 8-12 km Z2 or rest
3. Discipline focus:
Swimming. The bottleneck for most. Technique > volume — an efficient swimmer with 2 sessions/week outperforms a technically deficient swimmer with 4 sessions. Specific drills: long strokes with recovery, bilateral breathing, shoulder rotation, efficient kick. No coach? Effortless Swimming or Total Immersion videos.
Cycling. Most efficient discipline for training aerobic volume (no impact, fast recovery). 60-70 % of total weekly volume goes here. Focus on sweet spot (88-94 % FTP) and bike position (clip-on aerobars in Sprint are recommended, not mandatory).
Running. Keep running more conservative than in pure running plan because the race is only 5K after 30+ min of biking. 25-35 km/week is enough for Sprint. Focus on running efficiently with pre-loaded legs (bricks).
4. Specific bricks. The decisive triathlon element. The first 2-3 km of running after the bike has a unique biomechanical pattern — legs feel 'rubbery', uncontrolled cadence in the first 200 strides. Only trained with bricks. EntrenAI prescribes 1-2 bricks/week, with focus on stabilizing pace in the first 5 minutes of the run.
5. Transitions (T1 swim→bike, T2 bike→run). Each can cost 30-60 seconds for amateurs — equivalent to 1-2 % of total time in Sprint. The final 4 weeks, EntrenAI prescribes specific timed transition sessions with full setup.
The transition, drawn: what you practise every two weeks
A 3-minute T1 is 2 minutes given away. The plan includes a transition session every two weeks with the bike on a real rack; this is the order you rehearse.
T1
- Leave the water walking fast, not running
- Wetsuit down to the waist as you move
- Helmet BEFORE touching the bike
- Run with the bike by the saddle to the mount line
T2
- Dismount before the line, never on it
- Rack the bike; helmet off ONLY afterwards
- Elastic laces: no sitting down
- The first 500 m slower than the body asks for
Who is this plan for?
- My first Sprint triathlon (no experience). You've swum, biked and run separately. 14-16-week plan, 6 sessions/week, 6-8 h/week. Focus on building capacity in each discipline + learning transitions. Result: comfortable Sprint finish, 1:15-1:30.
- Improving my Sprint (intermediate). You've done 1-2 Sprints in 1:10-1:25. 10-12-week plan, 7 sessions/week, 8-10 h/week. Focus on optimizing all three disciplines and reducing transition time. Result: 1:00-1:15.
- Sub-1:00 Sprint (advanced). You've done 3+ Sprints in 1:00-1:10. 12-week plan, 8-10 sessions/week, 10-12 h/week. Double quality session/week in bike and running, swim technique with specific coach.
Don't meet the 400 m continuous swim prerequisite? You CANNOT start the triathlon plan. EntrenAI rejects explicitly — safety is paramount. The plan recommends 6-8 weeks of pure swimming first to build base.
Hours per discipline across the 12 weeks
From 6 to 10 hours a week, a deload every fourth week and a taper at the end. Swim, bike and run are split according to their weight in the race and in your profile; "brick" marks the weeks with a bike + run session back to back.
- Swim
- Bike
- Run
Your first weeks, in detail
Week 6
Intermediate build — first classic brick of the week| Day | Session type | Detail | Duration |
|---|---|---|---|
| Monday - Technical swim | Drills + moderate aerobic | 200 m easy freestyle warm-up. **Drills:** 4×50 m one-arm only + 4×50 m kick with board + 4×50 m breathing every 3 strokes. Main set: **8×100 m at comfortable pace** with 20s rest between each 100. 200 m easy cool-down. Total ~1,700-2,000 m. | 55 min |
| Tuesday - Bike sweet spot | Threshold intervals | 15 min Z2 warm-up. **3×12 min @ 88-92 % FTP (Sweet Spot)** with 5 min Z1 between sets. 10 min cool-down. ~70 min total. | 70 min |
| Wednesday - Easy run + strides | Aerobic volume | 8 km Z2 at 5:30/km + 6×100 m strides at the end. | 50 min |
| Thursday - Aerobic swim | Volume + long sets | 300 m easy warm-up + 200 m drills. **Main set: 4×400 m** at Sprint race pace (~target 7-8 min/400 m), with 30s rest between sets. 200 m easy cool-down. Total ~2,300 m. | 60 min |
| Friday - Classic brick | Consecutive bike + run | **Bike 50 min Z2 at 75-80 % FTP + fast transition + Run 15 min with first 5 min Z2 (stabilize) + last 10 min @ Tempo (~85 % VDOT).** Key session of the week. | 75 min |
| Saturday - Long ride | Bike aerobic volume | 75 min bike Z2 at 70 % FTP. Hydration + 1 gel from minute 50. | 75 min |
| Sunday - Long run or rest | Recovery or volume | 10 km Z2 at 5:30/km OR full rest depending on how you feel. | 0-65 min |
Week 11
Advanced specific — partial Sprint simulation, 3 weeks to race| Day | Session type | Detail | Duration |
|---|---|---|---|
| Monday - Technical swim + simulation | Open water if possible | 400 m easy warm-up + 200 m drills. **2×750 m at Sprint race pace** with 2 min rest between sets. 200 m easy cool-down. Total ~2,300-2,500 m. | 60 min |
| Tuesday - Bike threshold | Cycling quality | 15 min warm-up + **2×20 min @ 95 % FTP (Threshold)** with 8 min Z1 between sets + 10 min cool-down. | 85 min |
| Wednesday - Reduced brick simulation | Block-defining session | **Bike 30 min Z3-Sweet Spot + fast transition + Run 5 km at Sprint target pace** (~80 % VDOT). Focus on consistent pace from km 1 (no first 200 m blast). 15 min warm-up and 10 min cool-down. | 75 min |
| Thursday - Short quality running | Neuromuscular speed | 15 min warm-up + 5×400 m at target pace (~3:30-4:00/km) with 200 m jog + 10 min cool-down. | 50 min |
| Friday - Rest or very light | Recovery | Full rest or 30 min very gentle Z2. | 0-30 min |
| Saturday - Long ride with surges | Volume + high intensity | 75 min bike Z2 with 4×3 min @ FTP every 15 min. | 75 min |
| Sunday - Recovery + transitions | Technical practice | 30 min Z2 easy jog + **5 timed transitions** with full setup (race gear, helmet, shoes): - T1 simulated: out of swim → helmet → bike ready - T2 simulated: off bike → shoes → start running Goal: T1 <60s, T2 <30s. | 55 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.
- Pool access (25 or 50 m) + swim goggles + sport swimsuit + cap
- Road or triathlon bike with clip-on aerobars (important in intermediate/advanced, recommended in beginner)
- Aero helmet (15-30 W saving at Sprint speed, optional)
- Lightweight running shoes + cycling shoes with SPD-SL cleats
- Multisport waterproof watch (Garmin Forerunner 945+, Garmin Fenix 7, Suunto Vertical)
- Chest HR strap preferably (Polar H10, Garmin HRM-Pro)
- Trisuit or technical apparel usable across the 3 disciplines
- Bottles, gels, lock laces (fast transitions)
- For beginner swimmer: pull buoy + kickboard + short fins for drills
What most people get wrong (and how to avoid it)
- 1
Skipping the 400 m continuous swim validation
The most dangerous mistake. **66 % of triathlon deaths occur during the swim**, almost all from panic in open water without sufficient technical capacity. Can't do 400 m continuously in a pool (where you can stop anytime)? You can't do 750 m in sea/lake where there are no stops. EntrenAI explicitly blocks.
- 2
Never training in open water
Pool swimming is very different from sea/lake: zero visibility, waves, contact with other swimmers, wetsuit. The final 4-6 weeks, minimum 2 sessions in open water (with safety — outdoor pool or safe lake with company). Your first contact with open water should NOT be race day.
- 3
Underestimating swimming
Many amateurs come from running/cycling and underestimate swimming: 'it's just 750 m, I'll figure it out'. Result: swimming becomes suffering + stress that ruins the rest of the race. Swimming in triathlon contributes 15-20 % of total time — worth training seriously.
- 4
Starting bike too hard in T1
You exit the swim with HR 170+, max adrenaline, feeling you need to 'make up lost time'. You attack the bike at 90 % FTP. Result: you blow up at km 12 and the last 8 km are suffering + a fatal run. Correct strategy: first 5 km bike at 75-80 % FTP, rest at 85-90 % if feeling good.
- 5
Not training transitions
A 2-minute T1 instead of 60 seconds = 1.5 % of total time lost. Very trainable: timed transition practice, lock laces (eliminate tying), pre-set bike, gel already open on the frame. The final 4 weeks, EntrenAI prescribes 1 specific session/week.
- 6
Excessive running volume
Some triathletes come from running and maintain 50+ km/week on a Sprint plan. Excessive: for Sprint, 25-35 km/week is optimal. More running volume compromises bike sessions (muscular interference) and injury risk rises. Correct distribution is bike-dominant (45 %), moderate run (28 %), moderate swim (22 %).
- 7
Changing shoes or gels on race day
Universal triathlete rule: nothing new on race day. Shoes, gels, wetsuit (if applicable), even sunscreen — everything must have been tested in at least 2 prior simulations. Changing = high risk of GI issue, blister or cramp.
- 8
Insufficient pre-swim warm-up
Starting the race swim 'cold' = first 100 m very hard (HR spikes, you feel like drowning). Minimum 10 min warm-up before the start: 5 min on dry land activating shoulders + lats + 5 min in water if possible (50 m at increasing pace). Without it, the first 200 m of the race become panic for many amateurs.
Other Triathlon plan variants
Back to the general Triathlon plan
- AI-built Olympic triathlon planAn Olympic triathlon plan for a 1,500 m swim, 40 km bike and 10 km run: 14-18 weeks at 8-12 hours a week, with long bricks and peaking timed to your race.
- AI-built 70.3 triathlon plan (Half Ironman)A 70.3 triathlon plan for the Half Ironman: 1.9 km swim, 90 km bike and 21 km run over 16-20 weeks, peaking at 10-15 hours, with bricks and fueling.
- AI-built beginner triathlon planA beginner triathlon plan to finish your first sprint (750 m, 20 km, 5 km) in 16-18 weeks with no prior experience, including transition practice.
Frequently asked questions
14-16 weeks from a base of comfortable swim (400 m), regular biking (1-2×/week) and regular running (3×/week comfortable 5K). Lacking a base in one discipline, add 4-8 weeks to build it before the triathlon plan.
Separate plan of 6-8 weeks of pure swimming: 3 sessions/week with coach or video analysis. Technical drills + distance progression. When you complete 400 m comfortably continuous in pool, validate and start Sprint plan. Open water safety is non-negotiable — this CANNOT be sped up.
Road bike with clip-on aerobars is perfectly valid in Sprint. A TT (triathlon) bike saves 15-25 W at Sprint speed but isn't necessary. If you'll race 1-2 Sprints, the investment isn't worth it. Moving to Olympic/70.3? Consider a specific TT bike.
With specific prep between first and second Sprint (4-6 months): 5-12 minutes improvement is realistic. Most improvement comes from swimming (technique + open water confidence) and transitions (3-5 min combined).
Depends on water. <22 °C, wetsuit allowed and highly recommended (better buoyancy + thermoregulation). 22-24.5 °C, allowed but optional. >24.5 °C amateur, wetsuit NOT allowed. If your race is in cold water (<22 °C), training with wetsuit in the final 6-8 weeks is essential.
Yes, with bricks 1-2 times/week. But some sessions MUST be specific: the bike quality session (sweet spot) and the technical swim can't be productively combined with other disciplines. The plan optimizes what to combine and what to separate.
Doing multiple disciplines the same day: swim first (technique with fresh system) → bike → run. Except the brick which is bike → run specifically. Never running before technical biking (running fatigues legs to feel comfortable in aero position).
During 1:00-1:30 race: 1 gel in T1 (while putting on helmet and shoes) + another gel mid-bike + water/isotonic every 15-20 min on bike. 5K final run: water if hot, no gel needed. Pre-race nutrition (dinner + breakfast) is more important than during for Sprint.
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