Spells break fast bowlers, not overs

Total workload is the number everyone monitors, but the damage sits in how many deliveries came without a rest.

A fast bowler bowls twenty overs in a day and gets flagged. Another bowls twenty and does not. Same total, same body, wildly different consequences, and the reason is the shape of the day rather than its size.

Ten overs of a first spell in the morning is not the same as four spells of five spread across two sessions. In the long unbroken version, the last three overs are delivered by a bowler whose stabilising muscles have already stopped doing their job properly, and it is precisely in that state that the trunk starts compensating and the lower back takes load it was not designed for. Fatigue does not just reduce pace. It reshapes the action, and a reshaped action is where stress fractures come from.

Yet almost every workload system in the sport counts balls. Balls per week, balls per month, acute to chronic ratios built on totals. Those systems catch the bowler who has been overused across a season, which is useful, and miss entirely the bowler who is being destroyed one long spell at a time inside a perfectly reasonable weekly figure.

The number I would track is consecutive overs, weighted by how far into the spell each one came. The seventh over of a spell counts for more than the first. It is easy to compute, it is available from any scorecard without a single sensor, and it would tell a captain something he could act on within the hour rather than something a physiotherapist mentions in a monthly review.

The problem is that captains have a strong incentive to ignore it. Your best bowler is on, the batter is uncomfortable, and taking him off for a rest hands the initiative back for the sake of an injury that might happen in March. Every captain in history has made that choice, and given how careers are judged, most of them were behaving rationally.

Which is why it should not be the captain's call alone. Put a spell limit in the team plan, agreed before play, with the bowler and the coach and the medical staff in the room.

Then when the batter looks uncomfortable in over seven, the argument has already been had, and somebody other than the man holding the ball has to lose it.