Your First 70.3: A Female Athlete’s Guide to Half Ironman Training
A 70.3 is a 1.9km swim, a 90km bike, and a 21.1km run. Back to back. It sounds enormous. It is completely doable.
I have coached a lot of women to their first half Ironman. Comeback mums. Corporate professionals who travel every other week. Women who three years earlier could not swim a length of front crawl. Every one of them got to the line and across it.
Here is the whole roadmap. What the training actually looks like, the mistakes to sidestep, and how to fuel it so you finish strong instead of surviving.
A 70.3 is a fuelling and consistency event, not a talent event
Age-group women finish a 70.3 in roughly five to seven hours. That is a long day. It is won and lost on steady, consistent training and a fuelling plan you have practised, not on raw speed.
You do not need to be fast. You need to be consistent for the weeks before, and calm and fuelled on the day. That is a very different, much more welcoming challenge. And it is one that suits busy women brilliantly.
How Long You Need, and Roughly How Much
Give yourself a proper runway. If you can already swim, bike and run a bit, a 16 to 24 week build to your first 70.3 is realistic. If you are starting closer to zero in one of the three sports, add time rather than cramming.
Weekly training time usually lands somewhere around 6 to 10 hours across the three sports plus strength. That flexes with your life. The women I coach do not have endless hours. The plan has to fit school runs, work travel and hotel gyms, or it does not get done. Consistency beats heroics every single time.
A typical training week
Nothing fancy. This is the shape most weeks take in a first-timer build.
- Two to three swims. Technique first, then endurance.
- Two to three bikes. One longer ride at the weekend, one shorter quality session midweek.
- Two to three runs. One longer, one easy, sometimes one with a little intensity.
- Two strength sessions. Non-negotiable. More on why below.
- One brick session most weeks. That is a bike straight into a run.
- At least one full rest or easy day. Recovery is where you actually adapt.
The First 70.3 Checklist
Everything to tick off before race day. Kit, key sessions, open water practice, and a fuelling plan template. The one I give my athletes. PDF, straight to your inbox.
The Mistakes I See First-Timers Make
Only training your strongest sport
You love the bike, so you ride. The swim scares you, so you avoid it. Come race morning, the swim is the bit that rattles you.
Fix: Give the most time to your weakest discipline. It is where the biggest gains and the most confidence live.
Never practising open water
Pool swimming and open water are different animals. No black line, no walls, other people, and sometimes a wetsuit you have never worn.
Fix: Get in open water several times before race day. Practise sighting, and practise starting in a crowd. Always in a safe, supervised setting.
Skipping the long ride into run
Your legs feel strange running off the bike the first few times. Wobbly, heavy, not yours. If race day is the first time you feel it, it is a shock.
Fix: Do regular brick sessions. Even a 10 minute run off the bike teaches your legs the feeling.
Guessing your race fuelling
Under-fuel a five to seven hour day and you bonk. Try brand-new gels on race morning and your gut rebels. Both end days early.
Fix: Practise your exact race fuelling on your long sessions. Same products, same timing. Your gut is trainable.
Fuelling Your 70.3
This is where a lot of first-timers, women especially, come unstuck. Many arrive chronically under-fuelled, then try to race a long day on too little. Let us fix that.
In the weeks before
Fuel the training, every day, not just race day.
- Eat enough overall. You cannot build fitness on a deficit.
- Carbohydrate around your key sessions. It is your main endurance fuel.
- Protein across the day for recovery and to hold onto muscle.
- Practise your race-day breakfast before long weekend sessions.
On race day
The number most first-timers miss: you need real carbohydrate every hour.
- Aim for roughly 60 to 90g of carbohydrate per hour on the bike and run. Practise the amount so your gut is used to it.
- The bike is where you eat. It is easier to take on fuel there than on the run.
- Drink to thirst and take electrolytes, especially racing in the heat. Hello, Singapore.
- Start fuelling early. Do not wait until you feel empty. By then it is too late.
Do Not Skip Strength
Two strength sessions a week is not optional, even in a busy triathlon build. It holds your body together across all that swim, bike and run volume, keeps you injury-resistant, and makes you more durable in the back half of the race. Women get an added win here: strength protects bone as well. I have written a whole piece on why endurance women should lift if you want the detail.
The Last Two Weeks
You taper. Training volume comes down so your body soaks up all the work and arrives fresh. This is the part where most first-timers panic and think they are losing fitness. You are not. You are sharpening. Trust it, sleep well, and keep fuelling.
The Short Version
A 70.3 is a consistency and fuelling event, not a talent event. Age-group women finish in roughly five to seven hours.
Give yourself 16 to 24 weeks and around 6 to 10 hours a week, flexed around your real life.
Train your weakest sport most. Practise open water. Do your bricks.
Fuel every day in training, and take 60 to 90g of carbohydrate per hour on race day, practised in advance.
Keep two strength sessions a week. Taper and trust it in the final fortnight.
Your first 70.3 will be one of the proudest days of your life. Full face of makeup on the start line, obviously.
Sound familiar?
- You have signed up for your first 70.3, or you are circling it and scared to commit
- You want a plan that fits work, travel and family, not a generic PDF built for someone with endless time
- You want someone who has actually raced long course, all the way to Norseman
- You want to arrive fuelled, confident and injury-free, not just hanging on
If you ticked two or more, this is exactly what my coaching is built for.
Apply to work with me →If you want a 70.3 plan built around your life, with the fuelling done properly, that is what I do.
1:1 triathlon and running coaching for women, with performance nutrition built in. Female-specific, flexible enough to live, structured enough to get you to the line strong.
The application takes two minutes. I read every one myself. I will WhatsApp you within 24 hours on weekdays.
Apply to work with me →Frankie x