BMI by itself may not be a great predictor of health, but that’s not to say it’s altogether useless, it simply needs to be examined in relation to other metrics. This article is not going to discuss the pros or cons of using BMI as a proxy for Body Fat percentage or health status. Instead, we’re interested in looking at how BMI relates to performance. Since BMI is just a ratio between weight and height for any given height, a higher BMI means a higher weight. Since we can’t do much to change our height, the practical variable of interest for us is weight.
"Is There an Ideal BMI for Performance?" by Beyond the Whiteboard