Brazilian jiu-jitsu athletes had low body fat without differences between novices and experts or between elite and non-elite athletes.
Aerobic power was similar to that of other grappling combat sports and did not seem to be influenced by the Brazilian jiu-jitsu athlete’s competitive level.
Experience and competitive level seem to influence an athlete’s flexibility responses as experienced athletes had greater flexibility than beginners and elite athletes showed more flexibility than non-elite athletes.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5306420/

Naja, ein Anfang. Finde die Studie irgendwie nicht richtig ausgereift, überall fehlt es an weiteren Studien, aber mal ein Anfang.