Don’t Let Perceived Perfection Be The Enemy Of Good
01 | The Six Reps Problem
The question comes up regularly, usually from athletes who have been training seriously for a year or two and have developed a strong relationship with intensity. The session prescribes eight intervals. They want to know if they can do six at a harder pace instead.
The reasoning is coherent. Six hard reps feels more demanding than eight controlled ones. Harder feels like more training. More training feels like faster progress. The logic holds together until you examine what harder actually means in physiological terms.
The effort that makes six reps feel like a genuine test is, by definition, above the aerobic threshold. Above the aerobic threshold the body is drawing on anaerobic energy systems, producing lactate faster than it can clear it, and accumulating a recovery cost that is substantially higher than the aerobic session it replaced. The six hard reps took roughly the same time as the eight controlled ones. They produced a different metabolic stimulus, targeted a different energy system, generated more fatigue, and will require more recovery before the next session can be executed at quality.
The athlete who completed six hard reps has not done a harder version of the prescribed session. They have done a different session with a higher cost and a less specific outcome. And because the recovery demand is higher, the following day's training begins in a worse state, which means that session is also compromised. The single decision to swap eight for six has quietly degraded two sessions instead of one.
The same error takes a different form on the bike. An athlete whose programme calls for a four-hour easy ride does a fast three-hour ride instead because three hours of effort feels more productive than four hours of comfort. The training effect is not equivalent. The four-hour easy ride was building aerobic base, developing fat oxidation efficiency, and accumulating volume at a cost the body could absorb and continue training from. The three-hour hard ride was testing fitness that already exists, not building the infrastructure the long race demands. It felt better. It produced less.
02 | What the Session Is Actually For
Every session in a well-designed programme has a specific purpose that determines its structure. The number of reps, the effort level, the rest intervals, and the total duration are not arbitrary. They are calibrated to produce a particular physiological stimulus at a recoverable cost within the context of the surrounding week.
An eight-rep aerobic session produces its adaptation through the accumulation of time at the target effort. The first three reps prime the system. Reps four through six are where the primary stimulus is applied. Reps seven and eight extend the duration of that stimulus into the territory where real adaptation occurs. Cutting the session at six removes exactly the part that was most valuable. The athlete who finishes feeling like they could have gone harder has not underachieved. They have executed the session correctly. The effort ceiling was the point. Staying below it allowed the aerobic system to absorb the full stimulus without the recovery cost of a harder effort, which means the following day's session begins in a better state and can itself be executed correctly.
The session that feels unremarkable is usually doing exactly what it should. This is how training quality compounds across a week. It is also why a single well-executed session rarely feels like a breakthrough. The breakthrough is the cumulative product of many sessions executed as prescribed, each contributing its specific stimulus without creating a recovery debt that compromises the next.
03 | When the Body Disagrees With the Plan
The more common version of this problem is not an athlete trying to do less with more intensity. It is an athlete trying to hit target numbers on a day when the body is not producing them.
Sleep was poor. A difficult week at work has been running concurrently with the training block. The previous session was harder than it should have been. For any of these reasons, the intervals that are supposed to feel controlled feel hard, the paces that were manageable last week are not manageable this week, and the athlete faces a choice: push through to hit the prescribed numbers, or back off and complete the session at the effort that is available.
The instinct to push through is understandable. It feels like the harder, more committed option. It is also usually the wrong one. The training block compounds across weeks, and a session pushed through at too high a cost damages the sessions that follow it. An athlete who hammers a threshold session on depleted legs and then spends two days recovering from it has not accumulated more training. They have interrupted the training block to do one hard session that produced less specific adaptation than the prescribed session would have, and in doing so has quietly erased two days of the block that were supposed to be building something.
The session completed at reduced intensity on a compromised day is not a failed session. It is the correct session for the conditions that exist. Completing eight aerobic intervals twenty seconds per kilometre slower than usual because the body is not producing more than that is executing the session correctly. The aerobic system is still receiving a meaningful stimulus. The recovery cost is appropriate. The following day's training is not jeopardised. The distinction between a single flat session and a pattern of flat sessions is one of the most useful things an athlete can develop the ability to make. One flat session in an otherwise consistent week is noise. Three consecutive flat sessions with elevated resting heart rate and disrupted sleep is a signal worth acting on. Pushing through the first does not prevent the second from appearing if the underlying cause is genuine accumulated fatigue.
04 | What Coaches Are Looking At
The athlete who adapts their effort to daily conditions and completes every session is more useful to coach than the athlete who hits every target on good days and spirals when conditions are not right. The first athlete produces a reliable data set. Their session reports tell the coach something accurate about the relationship between training load and physical response. Adjustments can be made on the basis of real information.
The athlete who pushes through regardless of conditions produces something harder to read and more dangerous to act on. Consider what the training log looks like after a week in which the athlete was carrying significant unresolved fatigue but refused to reduce effort. The sessions show completed intervals, hit targets, acceptable times. The training stress score reflects a normal productive week. The coach, reading this log, prescribes the following week at a similar or slightly increased load. The athlete arrives at that week carrying fatigue that the log did not reveal, the sessions begin to deteriorate in ways that seem disconnected from the load, and neither coach nor athlete understands why, because every session on paper looked fine.
This is how athletes drift into overreaching without either party noticing until the damage is already accumulated. The training log became a performance rather than a record. The athlete was reporting what they wanted the week to have been rather than what it was. Honest reporting of how sessions feel relative to the effort required to produce them is more valuable to a coach than hitting targets at any cost. "Completed all eight reps but had to work significantly harder than last week to hold the same pace" is actionable information. "Completed all eight reps" without that context is not.
The athlete who reports accurately builds a coaching relationship that can genuinely calibrate to their individual response. The athlete who performs for the log builds a coaching relationship that is calibrating to a fiction.
05 | Accurate Training
Triathlon performance is built across years. The athlete who executes sessions correctly across a consistent training year, adjusting effort to conditions without drama, accumulates more specific adaptation than the athlete who pushes hard on every session, cycles through periods of overreaching, and rebuilds from reduced fitness several times per year.
This is not an argument for training conservatively. It is an argument for training accurately. Accurate training means executing sessions at the effort for which they were designed, completing the prescribed volume rather than substituting fewer harder reps, and adjusting to daily conditions rather than imposing a fixed demand on a variable body. It means understanding that the session feeling insufficient is not evidence that it was insufficient. It is evidence that the prescribed effort was correctly calibrated to what the aerobic system needed that day.
The eight reps at the right effort, completed consistently week after week with progressive demands, will produce an athlete who is measurably faster at the end of the block than at the start. The six reps at maximum effort, substituted because controlled work felt like not enough, will produce an athlete who is more fatigued, less specifically adapted, and increasingly confused about why the training is not converting into race performance.
Fitness is built during recovery, not during the session. The session provides the stimulus. Recovery converts it into adaptation. An athlete who provides a larger stimulus than their recovery capacity can absorb is not building more fitness. They are accumulating more fatigue at the expense of the adaptation the smaller stimulus would have produced cleanly. Complete the session. All of it. At the effort it was designed for.
If you want a programme where every session has a specific purpose and the prescribed effort is calibrated to produce that purpose at a recoverable cost, the Sense Endurance training plans are built with that precision from the first week.
If you want that calibration adjusted specifically to your fitness, recovery capacity, and training history, Sense Endurance Coaching gives you exactly that.