Six Hour - Half Ironman Training Plan

Six Hour - Half Ironman Training Plan

Flirting with the six-hour half-Ironman mark?

Here’s your plan for hitting your target and finishing healthy and strong. 

A successful training programme takes you to the edge of your ability without pushing you into injury. To master this delicate balance, it is important to make sure the easy days are easy, and that you adhere to the goal paces. There are some big sets in the plan. Listen to your body and back off if you have any specific pains or soreness. If you overdo it one day, future key sessions will be compromised and unproductive. It’s essential to arrive to the start line healthy.

Some Prerequisites

Because this plan covers the final five weeks of training prior to a two-week taper, you should already have a reasonable level of fitness before tackling it! Here’s what you should already have under your belt:

• Endurance: Two 4-to 4.5-hour base rides, two 2- to 2.5-hour base runs, regular swims of 2000–3000.

• Intensity: Three to four higher intensity run sessions with 5-7 kilometres total combined intervals, three to four high intensity bike sessions with 19-24 kilometres total intervals. Doing a couple of 1- to 3-hour races is also helpful.

Tips for success

• In the weeks leading up to your key race, plan ahead so that you can prioritise training over other obligations and interests. We all need sport-life balance; however, putting a short term emphasis on your race goal will be necessary.

• On rest days, rest. Avoid busywork and errands.

• Warm up and cool down properly to avoid injury and to facilitate post workout recovery.

• Choose the right race for a PB: Pick a flat, fast, well-organised course that isn’t typically hot or really windy.

• Train on courses and in environments specific to the demands of the race. Better yet, train on the course itself if possible. It can knock several minutes off your race time.

• Practise your open-water swimming skills* regularly to transfer pool swim times to race-day results.

• Practise and refine your race-day fuelling plan. Nutrition is the fourth disciplineof the half-Ironman and allows you to let your fitness shine through. Poor nutrition will derail even the most prepared, well-trained athletes.

About the plan

Since this programme is time goal-oriented, all the sessions are based on achieving specific paces. You will need to honestly assess your skills to pick your goal pace times for each sport. These times are your training targets. You will see the following pace-targeted terminology:

Base Endurance Pace: Builds your aerobic base, which is the pace you could maintain for a very long time. A strong aerobic system allows you to recover faster between intervals on speed days, and from day to day in your regular training programme.

Recovery Pace: Approximately the same as your endurance pace, but for shorter duration. It encourages blood flow (with oxygen and nutrients) to repairing muscles but is not hard or long enough to further wear you down.

Pace Work: Training done at your goal half-Ironman race pace. Maintaining a pace in training as you fatigue gives you the physical and mental skills that will help you reach your time goal on race day.

Lactate Threshold: Faster than half-Ironman pace, this effort is performed at your best average 30-minute bike or run pace. Pushing here will make it easier to sustain your race pace, which will feel slower than lactate threshold pace.

Speedwork : Your faster interval pace. You should feel the burn here. This builds speed and dynamic strength, which allows you to deal with shifting paces on race day (starting strong in the swim, passing athletes on the bike or cresting a hill on the run—and of course sprinting for glory toward the finish line!).

Don’t supersede the pace times in training. A common mistake among athletes is to go harder and longer on a day that they “feel good,” which doesn’t provide the body with the opportunity to adjust to the progressive training necessary for higher performance.

Your Skills / Pace Assessment

On separate days, prior to diving into this training plan, do an 800-metre swim time trial, a 40K bike time trial and a 10K run time trial. Match your  average 100-metre or mile pace to the lactic threshold paces indicated below. Decide if you are at the strong end, the mid-range point or the slower end of these ranges.

Goal Paces for a Sub-six-hour Race: Your goal splits must average the midpoint of the race goal paces below, i.e. 40:00 swim, 3:05 bike, 2:00 run + 10 minutes transitions = 5 hours, 55 min. If you are stronger in one discipline, you have wiggle room in the others! If you are below one of the ranges, start at the low-end training paces and try to train yourself up to the pace for race day. The worst-case scenario is you will still get faster than you were before!

Swim Race Goal Pace: 35–45 minutes: Training pace ranges:

Base endurance and recovery: 2:00–2:25/100m

Pace work: 1:50–2:10/100m

Lactate threshold: 1:45–1:55/100m

Speedwork: 1:30–1:45/100m

Bike Race Goal Pace (on flat terrain): 2:55–3:15

Training pace ranges:

Base endurance and recovery: 14.5mph–17mph

Half-iron pace work: 17.25mph–19mph

Lactate threshold: 19mph–21mph

Speedwork: 22mph–25mph

Run Race Goal Pace (on flat terrain): 1:50–2:10

Training pace ranges:

Base endurance and recovery: 9:15–10:30/mile

Half-iron pace work: 8:24–9:10/mile

Lactate threshold: 7:50–8:30/mile

Speedwork: 6:50–7:30/mile

Pool Skills For A Faster Swim Split

Deep-water acceleration: Try timed 50s with a deep-water (floating) start, with no push off of the wall. Begin by doing a scissor kick with your body horizontal with your feet near the surface, floating on your stomach. This will help to give you maximum acceleration. Do it with a few partners in your lane and see who gets off the line the fastest!

Head-up freestyle: To work on sighting technique in the pool do some head-up freestyle. This works your catch (the front end of your stroke) and teaches you to relax in a triathlon specific body position. Try swimming with your nose at the waterline for two to eight strokes, three to four times per 50 as you would in a race. Make sure not to drop your legs by increasing your kick slightly as you sight. Next, lift your head higher, to chin level. Finally, lift to chest level if you can.

Closed eyes: A good way to work on “straight swimming” is by doing freestyle the length of the pool with your eyes closed. Any stroke imbalances will become apparent when you bump into a lane line.

Drafting: Staying in another person’s draft in a race eliminates drag by 20–30 per cent. Practise swimming closely behind your lane mate (with their consent, of course, or take turns drafting) to get used to hanging onto someone’s pace.

The Fourth Discipline: Nutrition


1. Breakfast should be similar to what you eat on training days. Stick primarily with carbohydrates, a little protein and minimal fats. Toast and jam or a banana and porridge plus an electrolyte sports drink are popular choices. If you have a coffee on training days, have a coffee on race day.

2. Finish breakfast two to three hours before race start to give your stomach time to digest.

3. In the two hours before the race, sip water and/or an electrolyte sports drink.

4. Some athletes eat a gel just before the race start.


1. For the first 10 minutes of the bike, drink water and take in minimal calories, mainly in the form of sports drink. Start eating when your heart rate has dropped and you’ve settled into a good rhythm.

2. From 10 minutes after the bike start to 10 minutes prior to the bike finish, eat 200–350 carbohydrate calories per hour. Larger or muscular athletes tend to require the higher end of this range.

3. Drink 1 – 1.5 litres of fluid per hour (water and sports drink combined). This is approximately two small bottles to two large bottles per hour, depending

4. Set your watch alarm to sound every 15 minutes, to remind you to fuel.

5. A simple plan is to consume a gel every 30 min (~200 cal per hour) and a bottle of sports drink per hour (100 cal per hour). Drink up to 10 ounces of water per gel.

6. To avoid cramping, follow the recommended sodium intake of 500 750mg/litre.

7. Ten minutes prior to the bike finish you should reduce your calorie intake and only take in fluids. This allows your stomach to empty while still allowing your gut to absorb the food ingested.


1. Wait five to 10 minutes into the run until your heart rate levels off before starting your nutrition/hydration regime.

2. Often athletes’ heart rates are higher on the run than the bike. If this is the case, calorie consumption should be 15–30 per cent less per hour than on the bike.

3. Many athletes find liquid calories easier to digest on the run, in the form of sports drink or cola.

4. If you are running 6:00/K, you will hit approximately six aid stations per hour, if they are spaced at one per 1.5K. Aim to drink two small paper cups of liquid per aid station.


Understanding lactate threshold (LT) training is critical to improvement. Your LT determines how long and how hard you can exert near-maximum e ort. There’s a point when the body begins to produce lactate at rates that are too fast for it to metabolise—this is the LT.

To determine your LT, do field tests on the bike and the run on separate days, when your legs feel rested. After a warmup of 15 minutes (run) to 30 minutes (bike), do a 30-minute time trial on fl at terrain where you can hold your hardest uninterrupted effort for that duration (a bike trainer is ideal for the bike test and the track is a good option for the run).

Pace the time trial as evenly as possible. To determine your LT heart rate, hit the lap button on your heart rate monitor 10 minutes into the time trial. The average heart rate for the final 20 minutes is your LT heart rate.

1 <80% of LT Gentle rhythmic breathing. Pace is easy and relaxed. The intensity is a jog or very easy run or very easy bike spin.
2 80–87% of LT Breathing rate and pace increase slightly. Slightly deeper breathing, although still, comfortable. Running and cycling pace remains comfortable and conversation is possible.
3 88–93% of LT Breathing a little harder, pace is moderate. A stronger cycling or running rhythm, this is “feel good” fast. It is slightly more di  cult to hold conversation.
4 94–100% of LT Starting to breathe very hard, pace is fast and beginning to get uncomfortable, approaching all-out 30-minute bike or run pace. This pace should be challenging to maintain.
5 >100% of LT

Breathing is deep and forceful. Pace is all-out sustainable for one to five minutes. Mental focus required, moderately uncomfortable and conversation undesirable.

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