At first glance, Keijo comes off as incredibly silly and impossible to take seriously, but once one looks past the humorous and ridiculous appearances of the techniques the players pull off, true dread settles in when the sport of Keijo is watched from a medical standpoint. The things the Keijo players do to their bodies while on the land should be putting an immense strain on their bones, spines, muscles, tendons and fat tissues whenever using their techniques. The sheer punishment they push their bodies through in both training and in competition should be enough to leave irrecoverable injuries in the span of a couple of years, as there exists a limit on how much a body can heal before it starts deteriorating. This would leave the players forced to retire and once they do, they´re going to be stuck with sagging and unattractive shells of their former selves from all the physical abuse they suffered in the matches. With this in mind, it is no wonder that the Keijo-players are taking this sport dead seriously.
In the anime, this does get shown when Nozomi is begging Ujibe to teach her the Butt Vacuum Cannon. Ujibe's stern resistance to Nozomi's obsession with a strong but dangerous attack that eventually causes severe muscular damage to the user's pelvis and hips is implied to come from Ujibe's own Career-Ending Injury. Ujibe's use of the technique is shown to have eventually enacted its toll just after her last match, and she could no longer compete at the pro level afterwards, whereupon she eventually turned into the woman she is now. Ujibe is the example of what happens when Keijo players eventually hit their limit, and she expedited it by using this one technique that Nozomi is chasing. She does everything she can to dissuade Nozomi from learning and relying on the Butt Vacuum Cannon precisely because she has firsthand experience on how it breaks the female body, and doesn't want one of her students to go through the same pain.
