What a plateau actually is
A swimming plateau is when your best times stop moving even though the work is still happening. Not one messy 50 fly at a Level 1. A stretch of months where last best is still last best, and the car park conversation is “why am I not getting faster?”
The trap is treating every slow gala as the same problem. If you added time in January on a heavy week, that is often the season doing its job — tired swims, then a championship drop that unlocks the work. That story lives in Why Mid-Season Times Look Worse. If your limbs suddenly feel like they belong to someone else, that may be the body rewriting the stroke: Growth Spurts and Slower Swim Times.
This piece is the third thing: you have been trying, training is still on the calendar, and the clock will not budge. I built Finzy so key-set paces sit on a page instead of in a mood — not to invent a diagnosis.
One unrested club gala is a data point. A plateau is a pattern: last best stuck across a block. File the time. Then look at the weeks.
Training age is not your age group
Early in a swimming career — or after a long break — volume goes up, the body matures, and PBs arrive like buses. Later, load cannot rise forever. The easy gains are spent. What is left is smaller, slower to show, and easy to miss if you only look at Saturday.
Olivier Poirier-Leroy’s guide at YourSwimLog puts the split cleanly: early career is big jumps in volume, intensity, and frequency, plus growing up; later career is a load that has to stabilise. A study of age-groupers over a career (Tate and colleagues, 2012) saw training volume climb for years, then flatten. That flattening feels like failure. It is often the next chapter.
Training age is how long you have been doing real work, not how old you are on 31 December. A 10-year-old dropping a second every other gala is not the template for a 16-year-old chasing tenths. The board will look quieter. Quieter is not the same as stuck — unless the weeks are stuck too.
The mushy middle
This is the one I lived in. Every evening felt like a proper go. I left tired. I assumed that meant I was training. A lot of those weeks were the same grey pace — too hard to build an easy aerobic base, too easy to force race speed. Coaches call it the mushy middle: medium-hard, paid for in fatigue, not bought in fitness.
Intervals with a defined send-off so each piece is fast and clean. Contrast across the week so easy days stay easy and hard days can be hard. Progression: 10×100 on the same send-off at the same effort for six months is attendance, not overload. Your body adapted weeks ago.
You do not rewrite the coach’s programme from this page. You notice whether every session feels identical. Two weeks can both be 24,000 metres. One is mostly easy, a real threshold set, a few fast 25s. The other is 24,000 metres of “that felt decent.” Same total. Completely different week. For that split in more detail, see Why Swimmers Should Log Training.
Illustrative composite — not one swimmer’s data. Mid-season tired times often rise, then drop when rest is allowed. A plateau is flatter: volume stays up, last best does not move.
When fitness outruns the stroke
You can be strong, well-conditioned, and still stuck: there is only so much runway a messy stroke will give you. A 2020 study in the Journal of Strength and Conditioning Research followed 14- to 15-year-olds through a 16-week prep. Changes in a 400 test swim were influenced far more by technique than by energetics — about 85% versus 12% in that sample. Fitness still matters. The priority in that age-group, the authors argued, is still the stroke.
Condition outruns technique, then the fitness gains run out, and the clock stalls. When a coach changes your catch or breakout, times can stall while the new pattern is still thinking. That dip is the cost of a better stroke later. Extra kilometres on an unstable pattern often groove the old mistake harder.
Stroke count holding when you are tired. A longer breakout. Splits less ugly. Those often arrive before the PB. Keep them next to the time, or you will only remember the board.
You cannot peak every Saturday
A taper is a planned drop in volume before a championship so work already done can show. Intensity is usually kept. Younger swimmers often need only a few easier days. Research often talks about a modest lift — commonly around two percent, not a promise for Sunday. The coach sets the shape.
Age-group life in Ireland is a string of club galas inside the block. If you treat every Level 2 like Irish Open, you never get a training stretch or a true rest. A stuck PB on unrested Saturdays is not the same exam as a stuck PB after a proper taper. The mid-season guide is about times that add because you are tired. This is about last best that will not move even when you thought it might.
Sleep is not a wellness extra
Irish club life is early alarms, homework, and a 5:45am kick set. Sleep is part of the week. In 2025, Lundstrom and colleagues tracked 26 NCAA Division I swimmers in a heavy block. Controlling for sex, sleep duration predicted how fast they swam a 200-yard trial. Write last night’s hours next to the main set for three weeks. Mystery Tuesdays get less mysterious.
Too few galas, too many galas
Too few races and you never practise the thing you are judging yourself on: pacing, turns under heat, the ugly last 15 metres. Training fitness does not automatically become a gala swim. You need some information weekends.
Too many, and the calendar is a string of slightly tired Saturdays — no block, no recovery, always “in the mix.” A packed run of Level 1s and 2s can feel like commitment. It can also be why nothing ever peaks. Ask which weekends are information and which are meant to be fast.
1:04.8 since November, six sessions a week
Imagine a 14-year-old whose 100 free SC has sat at 1:04.8 since last autumn. Attendance is grand. Every gala is on training. The 10×100s have been “about 1:16” for months — 1:14 on a good Tuesday, 1:19 on six hours’ sleep, averaged into a feeling. That is a plateau shape. The missing piece is usually the record, not another kilometre.
Causes of a stuck clock
Most plateaus are a pile, not a single villain. Sort with the table, then take the pattern to the person who writes the sets.
| Cause | What it feels like | What to check | Not the same as |
|---|---|---|---|
| Mushy middle | Tired every night, no contrast | Are key-set paces identical for weeks? | Working hard |
| Training age | Used to drop every gala | Years of real training, not age-group | Giving up |
| Technique lag | Fit, messy, thinking about the catch | Stroke count, missed walls, new cues | Need more kilometres |
| No rest | Always “nearly” | When did you last race actually rested? | A mid-season add on purpose |
| Sleep debt | Heavy, short fuse, flat 100s | Hours written for three weeks | Lack of talent |
| Too many galas | Never a block, never a peak | Race weekends in a row | Being competitive |
| Too few galas | Training times ok, races ugly | Last proper race, not a lane time trial | Need more volume |
| Growth spurt | New body, old stroke | Height, clumsiness, months not days | This plateau — see the growth guide |
A stuck clock is evidence for a conversation, not a licence to add a 5:30am on your own. Extra grey kilometres usually deepen the mushy middle. Bring the weeks.
A 3-week log experiment
Memory is a terrible coach. You remember the heroic Thursday. You forget that every other main set was the same “solid.” Three honest weeks of key-set paces is enough to see whether the middle is mush. That is why I wanted those paces in Finzy — visible, not a vibe from the car park. It will not tell you that you have plateaued. It will stop you inventing a better week than the one you swam.
Pick one or two sets that actually repeat. Write what you held, especially the last repeats — that is where the mush lives. Pair it with a goal you can actually track; Goal Setting for Swimmers is the companion to this experiment.
- ✓Choose one or two key sets that show up most weeks. Do not log every 25 of warm-up.
- ✓Write the send-off and the times you held, including the last three repeats. “About 1:16” is how the middle stays hidden.
- ✓One word of effort: easy / solid / proper hard. If every day is solid, you have a finding.
- ✓Sleep hours from last night. A 1–5 “how wrecked” is enough.
- ✓Attendance: made the session, late, or sat out the quality set. Sitting out the main set is not a tick.
- ✓Note galas: in-season on training, or any rest at all. Do not compare a tired 1:06 to last summer’s 1:04.
- ✓Do not back-fill from memory. If you missed Tuesday’s note, start at Wednesday.
- ✓Sunday, ten minutes: are the key-set paces moving, sliding, or identical? One question for Monday — not a new programme.
Log pace on key repeats for three weeks. Memory hides the mushy middle.
If the log shows real contrast, real sleep, and a rested gala still stuck, that is a different conversation — technique, the event, the season. If every evening was medium-hard, you already know more than the board told you.
