You have been training for two years. You ride when the weather is good, you run when you feel guilty, you swim when it crosses your mind. Your weekly volume looks like an ECG.
And you are stuck.
The problem is not your motivation, that part is fine. The problem is that you stack sessions instead of building a trajectory. A season is not a pile of good intentions. It is a structure, with an order, and the order is not decoration.
The principle that governs everything
One rule runs periodisation, and Joe Friel has been repeating it for thirty years: the closer you get to your race, the more your training has to look like it.
Far from the goal, you build general qualities. Close to the goal, you rehearse the race. In between, you convert one into the other.
Everything else follows from that.
The twelve-week skeleton
You don’t start from today and work forward to your race. You start at your race and count backwards. The event date is the only fixed point.
Weeks 1 to 6: Base. You build the engine and the chassis. Plenty of low-intensity volume, strength work in the gym, swim technique, some sweet spot if your hours are tight. Nothing looks like your race yet, and that is normal. You are baking the cake, not icing it.
Weeks 7 to 10: Build. The sessions turn specific. You work at threshold, you bring in bricks, you ride at your target power, you run at your target pace. Gym work drops to maintenance: one session a week, heavier than it is long. Volume flattens while intensity climbs.
Week 11: the taper. You cut volume, you keep intensity.
Week 12: the race.
The split is not sacred. The order is: general before specific, volume before intensity, and never the other way round.
Three weeks up, one week down
Inside each block you load for three weeks and back off for one.
Week 1, moderate load. Week 2, add 10 to 15%. Week 3, the heaviest of the block. Week 4, cut volume by 30 to 50% and take the edge off the intensity.
That fourth week is not a reward and not a weakness. It is where you get better. The session creates the stimulus, the rest creates the adaptation. An athlete who runs four loading weeks back to back without ever cutting piles up fatigue and thinks he is piling up form.
An important nuance most plans ignore: past fifty, or if you recover slowly, you switch to three-week cycles, two loading and one recovery. This is not about the number on your licence, it is about how fast you actually recover.
The signal that doesn’t lie: if you are still tired 48 hours after a hard session, the session was too hard. If you are never tired after three loading weeks, you are not training enough.
How much intensity, really
Here is where nearly every age-grouper gets it wrong, and where the public debate is dumbest.
The split depends on your volume, not on an ideology.
Under 6 hours a week, doing nothing but zone 2 wastes your time. You don’t have enough hours for volume alone to create a stimulus. Sweet spot becomes your best tool, two to three sessions a week at most, never more.
Past 10 to 12 hours, the equation flips. Easy volume becomes the foundation again, and you move towards a polarised split: around 80% of your time below the first threshold, 20% genuinely hard, and very little in the middle.
That middle is the trap. Too hard to recover from, too soft to overload. It is where the self-taught drown: they go moderately hard every day and wonder why nothing moves. Your easy days have to be really easy, or your hard days can’t be really hard.
Two hard sessions a week. Three if you are solid and well recovered. Never three hard days in a row.
What an 8-hour week looks like
The most common format for an age-grouper with a job and kids.
Monday. Full rest. No “little recovery spin” that is neither rest nor training.
Tuesday. Hard bike session. Threshold or sweet spot depending on the phase, an hour fifteen to an hour thirty.
Wednesday. Swim technique, thirty to forty minutes. Plus a short easy run if your tendons can take it.
Thursday. Hard run session. Threshold or intervals, an hour in total, warm-up included.
Friday. Swim technique. Gym, maintenance.
Saturday. The long ride, two to three hours, with blocks at target intensity during the build phase. Ten to fifteen minutes of running off the bike.
Sunday. Long easy run, or rest if the week was heavy.
One hard session per discipline per week. The rest builds volume. And one clean day off, non-negotiable.
The taper, or how to wreck twelve weeks in seven days
The last week is where people panic and do stupid things. Either they keep training, afraid of “losing” something, or they stop dead and show up flat.
The rule: cut the volume, keep the intensity.
Take volume down 40 to 60% from your biggest week. Keep the short sharp touches: 90-second intervals at race intensity, fewer of them as the week goes on. Your session frequency barely changes, their duration does.
The easiest day of race week is two days out, not the day before. The day before, you do a very short opener in all three disciplines, in race order, just to wake the nervous system up.
What you lose in fitness during the taper is tiny. What you gain in freshness is huge. Fatigue drains fast, fitness leaves slowly. That is the whole principle, and that is why it works.
What you measure to know it is working
A plan with no test is a belief.
At the start of the block you put your numbers down: a 20-minute bike test for your FTP, a benchmark race or a pace test for the run, a 400 then a 200 metres for your swim threshold speed. Those tests define every zone you use.
At the end of each four-week block, you redo the one that matters. Without recent data, your zones are guesses and your plan is fiction.
A free and underused indicator between tests: compare your normalised power to your average heart rate on a regular easy ride. If that ratio climbs week after week, your aerobic engine is genuinely thickening. If it flatlines for six weeks, something in your plan is wrong, and it isn’t your motivation.
The Cornerman verdict
Twelve structured weeks beat twelve months of enthusiastic improvising. This is not a question of willpower or free time, it is a question of the order of operations.
General before specific. Volume before intensity. Three weeks loading, one resting. Two hard sessions, not five. Easy days really easy.
And one fixed point: your race date. Everything else is deduced backwards.
If you don’t have that skeleton, you are not training. You are just doing sport.