![]() This will become interesting in a moment when we find out that there is a much higher percentage of “Overweight” male BTWB users compared to US males. Overall, male BTWB users have lower average BMIs than US males. The average BMI for US males age 30-59 is 29, while the average for BTWB users in the same range is 27.5. This will give us some baseline comparisons between the two groups.įor the 20-29 age group, the BMIs are very similar but when we look at the 30+ age groups, we start to see some significant differences. We’ll start our analysis by comparing the average BMI of all US males to our sample of BTWB users, separated by age group. We’ll see that the BMI trends for men and women differ dramatically, especially when we look at the groups with high Fitness Levels. We’re going to take a look at the BMI dynamics for men first, and then we’ll analyze the women. It’s not surprising that we find that the higher BMI of our top male users are not due primarily to higher body fat. The NIH also notes that BMI “may overestimate body fat in athletes and others who have a muscular build.” This is particularly relevant for our analysis, since our subjects will likely be more muscular than the national average. BMI is an estimate of body fat and a good gauge of your risk for diseases that can occur with more body fat.” The BMI ranges are: Female BTWB users with a BMI of 22-26 had substantially higher average Fitness Levels than other rangesĪccording to the NIH, “BMI is a useful measure of overweight and obesity.Average BMI for top Female BTWB users is 24.0 with a 30.0″ waist.Male BTWB users with a BMI of 26-28 had substantially higher average Fitness Levels than other ranges.Average BMI for top Male BTWB users is 27.2 with a 33.5″ waist.C omparing those data points with national data from the CDC and JAMA yielded some interesting correlations: To accomplish this we compiled the weigh-ins of over 75,000 BTWB users who have been using our service for an average of 13 months as well as those users scores on our proprietary metric of well-rounded fitness- the BTWB Fitness Level. We decided to dig into the BTWB database and see if we could use our wealth of accumulated numbers and statistics to shed light on the situation. ![]() pull-ups, muscle-ups, rope climbs, box jumps, handstand push-ups, running, etc. While absolute strength is desirable, in CrossFit a higher body weight can be a disadvantage in many movements, e.g. Given that it’s due to an increase in muscle mass, it’s assumed that being heavier should allow for more absolute strength development (look at the difference in totals between the lighter and heavier Olympic Weightlifting weight classes, for instance). Will Jeremy, who is always going to be 5’10” (sorry bro), perform better at 185, 200, or even 215 lbs? I’ve coached my brother Jeremy Kinnick (4x individual Games athlete) since 2007 and we’ve experimented with him competing at various weights, in search of the optimal weight for his frame. In terms of performance in CrossFit, is there such a thing as being too heavy or too light for your height? As a coach, I have long suspected that such a dynamic exists. Since we can’t do much to change our height, the practical variable of interest for us is weight. Since BMI is just a ratio between weight and height for any given height, a higher BMI means a higher weight. Instead, we’re interested in looking at how BMI relates to performance. This article is not going to discuss the pros or cons of using BMI as a proxy for Body Fat percentage or health status. ![]() fat present in a body.īMI 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. Most glaringly BMI focuses solely on scale weight, neglecting body composition- the amount of muscle vs. Historically considered an important health marker, current research raises questions about the efficacy of BMI as a health marker- most famously when pro boxing superstar Evander Holyfield was found to be technically “obese” according to BMI metrics. Body Mass Index, or BMI, is an almost two hundred year old concept that roughly establishes a ratio between a person’s height and body weight.
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