What consistency tells you that a personal best doesn’t

Most parents have watched their child do something brilliant exactly once. A run nobody saw coming, a touch that made the sideline turn round. And then a whole season of waiting for it again.

There is a measure for that, and we put it in every report. dVr compares a current or average performance against that athlete’s own best recorded performance. It is a gap, not a ranking. It does not compare your child with anybody else’s.

A small, stable gap means a repeatable athlete, one whose Sunday looks like their Tuesday. A gap that grows can mean fatigue, poor recovery, technique breaking down under load, or simply that we tested on a bad day and should say so.

This is why we record every repetition rather than only the best one. The best attempt shows what an athlete can do on a good day. The full set shows what they can be relied on to do, which is what a development plan has to be built on.

How dVr is measured

Every timed test in the Athletic pillar is run more than once, from the same start position, with the start type recorded and adequate recovery between maximal efforts. The best valid attempt is used for the benchmark comparison, because a benchmark is a comparison of ceilings. All the valid attempts are used for the consistency analysis.

dVr is the difference between the athlete's current or average performance and their own best recorded performance. Same athlete, same test, same protocol. It has nothing to say about anyone else. A sprint over ten metres, a 5-0-5 agility turn to each side, a counter-movement jump: each gets its own reading, and the pattern across them is what the assessor reads.

Because it is measured against the athlete's own history, dVr gets more useful with every visit. On a first assessment it describes the spread across one session. By the third retest it describes a trend, and a trend is far harder to misread than a single number.

What the patterns mean

We read dVr as one of four patterns, and each has a response written into the standard.

Low and stable. Performance is consistent. The current progression plan continues.

Improving over time. Repeatability and readiness are getting better. Training progresses appropriately.

Moderate variation. Either normal variation or emerging fatigue. Recovery, warm-up, workload and technique are reviewed before anything else changes.

Large or rising variation. Possible fatigue, inconsistency, asymmetry or a performance concern. We investigate before increasing training demand, not after.

The last of those is the reason dVr is in the report at all. The most common mistake in youth development is to see a personal best, conclude that the athlete is ready for more, and add load. If that best was a one-off sitting a long way above the usual, the athlete was not ready. They were fresh, or lucky, or both. A rising dVr is the early sign that something in the support around the athlete needs attention, and it usually shows up before a drop in the best result does.

What it does not tell you

dVr does not say why. A widening gap can come from poor sleep, a growth spurt, a technique that holds at low speed and breaks down at high speed, a niggle the athlete has not mentioned, or a testing day that was simply worse than the last one. The assessor's job is to look at the gap, then look at the conditions recorded alongside it, then ask. The gap is the reason to ask. It is not the answer.

It does not rank athletes. Two players can have identical dVr readings with best performances a second apart. Consistency is a property of one athlete over time, and comparing it across children says nothing useful about either of them.

And it is not a verdict. A large dVr on a given day is one assessment under known conditions. It gets a note in the report, a specific recommendation, and a retest date, like everything else in there.

Why a parent should care

Because the season is long and a single moment is short. The thing you saw once is real. It is what your child can do. The thing you want to know is whether they can do it on a Tuesday evening in February when it is raining and they are tired, and that is a different question with a different measurement.

A development plan built on the best day sets the athlete up to fall short of it, week after week, and a child who keeps falling short of a number stops believing the number. A plan built on the usual day, with the best day as the target, is one they can train towards and hit. That is the plan we write, and it is why the retest date matters as much as the result: the next set of attempts is what tells you whether the gap has closed.

That is why the full set of attempts goes in the report and not only the best one. It is less flattering, and more useful.