Free 70.3 Training Plan Template — 16 Weeks

Every TriWorldHub plan follows the same structure, so once you learn to read one, you can read them all.

Each triathlon training plan is divided into four phases that progress from general fitness to race-specific readiness. Inside each phase, weeks are organized into a microcycle pattern: typically three weeks of progressive load followed by one recovery week. This 3:1 pattern reflects how the human body usually adapts to endurance training.

Stress accumulates faster than recovery, so periodic deload weeks let the deeper adaptations (mitochondrial growth, capillary density, hormonal balance) catch up to the surface-level fitness.

Each daily session lists three things: the discipline (swim, bike, or run), a duration in minutes, and an intensity prescription.

Intensity is written in heart rate zones, power zones for the bike, or pace ranges for the run. When a session says “Bike – 75 min, 3 × 12 min sweet-spot,” it means a 75-minute ride that includes three twelve-minute intervals in the sweet-spot zone, with recovery between them.

Warm-up and cool-down are assumed. If the math says you have 36 minutes of work inside a 75-minute session, the remaining 39 minutes are easy spinning to bookend the effort.

Days without a session are real rest days, not “optional” days. Skipping rest is the most common mistake first-time plan-followers make. If you’re tempted to add a session, swap it for a mobility or strength block instead. The schedule already accounts for the volume your body can absorb.

Triathlon training works because it stresses different physiological systems on different days. Mixing those systems randomly leads to mediocre results. If you target them with precision, the results will be much better. Intensity zones are the language we use to target them.

The Four-Zone Model

•       Zone 1 – Recovery. Below 65% of FTP, below 65% of max heart rate, RPE 1–2. Conversational, nasal-breathing, easy. Used for active recovery rides, easy swims, and post-race spins. You should finish more relaxed than you started. Most athletes drift too high here and lose the recovery benefit.
•       Zone 2 – Aerobic endurance. 65–75% of FTP, 65–75% of max heart rate, RPE 3–4. The zone where mitochondria multiply, capillary density grows, and fat-burning enzymes develop. The majority of your weekly volume should live here, typically 70–80% of training time, even for advanced athletes. If you can hold a full sentence but not a paragraph, you’re in Zone 2.
•       Zone 3 – Tempo / Sweet-spot. 75–88% of FTP, 76–87% of max heart rate, RPE 5–6. The most time-efficient zone for raising threshold without the recovery cost of full-threshold work. Bread-and-butter intervals for triathletes sustained 10–30 minute efforts that develop the engine you’ll race with.
•       Zone 4 – Threshold and above. 88%+ of FTP, 88%+ of max heart rate, RPE 7–9. Encompasses both lactate threshold (88–105% FTP, where lactate production matches clearance) and VO2 max efforts (106%+ FTP, short 3–6 minute repeats). Used in measured doses to raise your race ceiling. More is not better, too much Zone 4 burns deeper systems faster than they recover.

RPE – the backup gauge

Heart rate straps die, power meters drift, and GPS signal flakes out in the woods. Rate of Perceived Exertion (RPE) on a 1–10 scale is the analog backup that always works. Zone 2 is RPE 3–4. Zone 4 is RPE 7–8. If your devices and your RPE disagree, trust your RPE more than the number on the screen. Your body has been measuring effort longer than any sensor.

A common beginner mistake is to do the same training every week and expect it to keep producing results. The body adapts to repeated stress and then plateaus.

Periodization solves this by changing the type and amount of stress in deliberate phases. Every TriWorldHub plan, regardless of distance, uses four phases:

• Base phase builds the aerobic engine. Long, easy volume dominates. Intensity is low, duration is moderate-to-high. The goal is mitochondrial density, capillary growth, and the ability to burn fat efficiently. This is the slowest-feeling phase and the most important one, every later phase is built on this foundation.
• Build phase adds intensity. Threshold and sweet-spot intervals replace some of the Zone 2 volume. Sessions get harder, weekly hours plateau or rise slightly. This is where speed becomes accessible without losing the endurance you built in the base phase.
• Race-specific phase trains the exact pace, terrain, and conditions of your goal race. Long bricks (bike-into-run) become weekly. Open-water swim simulations appear. The plan begins to look like the race itself.
• Peak and taper stage reduces volume by 30–50% while preserving intensity. The body sheds accumulated fatigue and arrives at the start line fresh. This phase feels strange because you’re training less, but you should feel sharper, not softer.

Swim: Technique Compounds Faster Than Fitness

In running, fitness usually beats form. In swimming, the opposite is true.

A poorly streamlined swimmer with an aerobic engine of a champion will still get dropped by a technically clean swimmer with half the fitness.

Your plan prioritizes swimming technique drills, such as catch-up, finger-drag, side-kick, and scull, early and adds aerobic and speed work once your stroke holds together under fatigue. Open-water swim sessions appear in the race-specific phase to teach sighting, drafting, and pacing in a wetsuit.

Bike: The Discipline That Decides Your Race

The bike leg is the longest part of every triathlon and the place where most races are won or lost. Plans emphasize sustainable power output, not maximum power.

Long Zone 2 rides build the engine; sweet-spot and threshold intervals raise the ceiling. Aero positioning, cadence (target 85–95 rpm for most athletes), and fueling strategy are practiced on every long ride so they become automatic on race day.

Run: The Discipline That Hurts

Triathlon running is run-after-cycling running, which is a different sport than open marathon running. Plans use a high ratio of easy aerobic running with strategic threshold and VO2 work. Cadence (target 170–180 steps per minute), posture (slight forward lean from the ankles, not the waist), and breathing rhythm are reinforced session after session.

If you’re new to running, expect your first six weeks to feel disproportionately hard, the connective tissue adapts more slowly than the aerobic system.

Daily nutrition supports training, and your race-day fueling protects performance. They are different problems with different answers.

Daily Training Nutrition

Match your carbohydrate intake to your training volume. Easy days need fewer carbs; long days need many more.

A useful rule of thumb is 5–7 g of carbohydrate per kg of body weight per day during base phase, scaling up to 8–10 g/kg during the highest-volume weeks. Protein supports recovery and stays roughly constant at 1.6–2.0 g/kg per day. Dietary fat fills the rest of the energy needs and supports hormone function.

Race-Day Fueling

Race-day fueling targets vary by distance:

• For sprint and Olympic races, hydration and a small amount of pre-race carbohydrate usually suffice.
• For 70.3 and Ironman, you’ll need 60–90 g of carbohydrate per hour during the bike and run, plus 500–1,000 ml of fluid per hour depending on temperature.

Sodium replacement matters in hot conditions – 500–1,000 mg per hour for most athletes. Practice your race-day fueling on every long session. Race day is not the day to discover that the gel you bought makes you nauseous at 30 km.

• Skipping easy days. Easy days are where adaptation happens. If you can’t resist training hard every day, you’re not training, you’re grinding.
• Ignoring strength work. Two short sessions per week prevent more injuries than any amount of stretching. Athletes who skip strength work are the athletes who develop plantar fasciitis, IT band syndrome, and lower back pain mid-plan.
• Treating the plan as a maximum. Your plan is the prescription, not the target. Doing more can only lead to injury and overtraining.
• New gear on race day. Race day is the wrong day for new shoes, a new wetsuit, a new gel flavor, or a new bike fit. Every variable on race day should be one you’ve tested in training.
• Skipping the long brick. The single most race-specific session in your plan is the long brick in the race-specific phase. Missing it is the difference between holding your bike pace into the run and walking to the first aid station.