Choosing challenge formats that survive week six

Organisers of team activity challenges often describe a pattern: strong sign-up in week one and a drop in participation in the middle weeks. We have no data of our own on when, or how steeply, so treat the pattern as a working assumption. One plausible cause, and the one this article works from, is a competition structure that rewards the people who were already active beforehand.

This article compares four structures and identifies which ones keep newcomers involved.

Why the middle weeks are risky

Three effects compound:

1. The points gap is already too wide. In a hypothetical example, after five weeks the leading team could be 40% ahead of the last. Once winning is no longer possible, some participants may cut their effort once the outcome looks settled.
2. Newcomers are measured against people with a base. Take a hypothetical hour of training in which a newcomer covers 5 km while a long-standing runner covers 12 km (illustrative figures, not data). Scored on absolute output, the newcomer is always at the bottom.
3. There are no short milestones. A 12-week challenge with a single results announcement is too far away to create any rhythm of effort.

Four structures and their survival points

1. Mixed teams, scored on the mean

Teams of 6–8, with the team score being the arithmetic mean of its members. This flattens differences in baseline, but it has a familiar hole: one person taking a week off pulls the mean down hard, which applies reverse pressure to anyone who is ill or travelling for work.

The fix: replace the plain mean with the mean of the best 5 out of 7 days. Someone who rests a few days is not punished heavily, but nobody can abandon a whole week.

2. Repeated short stages (2 weeks per stage)

Split into six 2-week stages, each with its own results announcement and a reset of points back to zero. The gap is cleared regularly, so a weak team still has a route back in the next stage.

In our reasoning this is the easiest structure to operate and the one that gives a trailing team the clearest way back: one spreadsheet and one announcement every two weeks. We have no retention data showing that it keeps more people than the other structures.

3. Paired round-robin matchups

Each week two teams are paired, a win or loss is recorded, and the winner earns ranking points. Nobody is eliminated, but every week has a real “match”.

The drawback: it needs an even number of teams and someone to run the schedule. With 6–8 teams it is easy; with 30 teams it becomes complicated.

4. Accumulation with a cap

Each person can score a maximum of N points per day. This guarantees that someone training for two hours cannot pull far ahead of someone training for thirty minutes, but it rewards the group that was already consistent and adds no incentive for newcomers.

Comparison table

The ratings in this table are the editors’ judgement, not measured data.

Recommendation

For a workplace, choose repeated short stages, and set the intensity milestone against general activity guidance: WHO’s fact sheet cites at least 150 minutes of moderate-intensity activity per week; we have not verified the upper figure or the vigorous-intensity range. That figure is used to define “enough”, not as the maximum score — setting the cap exactly at the recommended level makes heavy trainers feel their effort is pointless, while setting the cap higher drives newcomers away.

One practical rule: daily cap = 2 × the recommended level divided by 7. At 150 minutes a week, the cap is about 43 minutes a day. Anyone who wants to do more puts the excess into the team’s shared point pool rather than their personal score.

Sources

• WHO, Physical activity fact sheet — at least 150 minutes of moderate-intensity activity per week (opened 2026-10-31)