Tracking block and defense improvement

During the 2016 season, one of the things we focused on with the Midwestern State team as the Lone Star Conference season progressed was improvement in our block and defense. Our block timing was poor. That meant not only few blocks, but also few digs. Though we also needed improvement in defensive position and actual digging. We were bottom of the league standings in both categories at one point, I believe.

Per set figures

Toward the end of October I ran some numbers to gauge our progress. I first started with blocks/set and digs/set. Those are the commonly reported figures, so it made sense.

Through the first round of conference matches (10 total), we averaged 1.17 blocks and 11.16 digs per set. Over the course of the first five matches of the second half of the season we averaged 1.57 and 15.47 respectively. That’s pretty good.

Percentages

A coaching friend suggested I look instead at block and dig percentages. Basically, that divides those figures by the total number of non-error attacks (blocked balls excluded from the error count). Since attack numbers can vary from match to match – and five set matches always mess with per set averages – the percentage approach is the better way to go.

For the first half of the season our block percentage was 4.5%. Our dig percentage was 42.1%. That adds up to a total “stop” percentage of 46.6%. For the first five matches of the second half the comparable percentages were 4.9%, 48.3%, and 53.2%. Again, gains across the board.

In each but one of the second half matches our block percentage was higher than against that same team the first time around. The same was true of the dig percentage (different match). Similarly, when looking at the total figure, only one match was worse the second time than the first.

Limitations

While these comparisons tell us the team was more effective in defense for the first five matches of the second half of the conference season, there is a limit as to how far you can take the analysis. What happens on the other side of the net leading to an attack matters. If you do a better job putting a team in difficulty through tough serves and/or good attacks, you will likely find it easier to block or dig their attacks.

Also, ultimately what you want from your defense is it to generate point scoring. That means it’s worth extending the analysis of something like dig percentage to see how many swings you get from those digs and how efficiently they convert into points.

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John Forman
About the Author: John Forman
John most recently coached for an NCAA Division II women's team. That followed a stint as head coach for a women's professional team in Sweden. Prior to that he was the head coach for the University of Exeter Volleyball Club BUCS teams (roughly the UK version of the NCAA) while working toward a PhD. He previously coached in Division I of NCAA Women's Volleyball in the US, with additional experience at the Juniors club level, both coaching and managing, among numerous other volleyball adventures. Learn more on his bio page.

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