The world’s top athletes gather every two years to compete for honor. Some of sport’s most inspiring and unifying moments have occurred during the summer and winter Olympic games. But everything is not just for fun (no pun intended). There are Olympic rules that competitors must abide by when it comes to conduct both on and off the field, some of which are next level enigmatic.

Boxers must be shaved clean.

Competitors in boxing are required to be either clean-shaven or have minimal facial hair.

Gymnasts are not permitted to wear brightly colored nail polish.

Gymnasts are allowed to wear colorful makeup, but they cannot wear vivid nail polish. It’s either neutral or none at all for these athletes.

Olympic athletes are not permitted to protest while competing.

On the field, in the Village, during ceremonies, or at the opening and closing ceremonies, athletes are not allowed to demonstrate. Prior to the 2020 competition, the rule was put into place, and it has drawn harsh criticism.

Athletes can receive endorsements. They just can’t talk about them publicly.

Athletes are able to secure endorsements and receive payment for them. The athlete is not allowed to mention them during the competition, and the company is not allowed to advertise the athlete.

Pants are required for men’s ice skating.

Contrary to popular belief, male figure skaters do not typically don tights. For the dress code, pants are required.

Competitors in women’s figure skating must wear skirts.

Women are not required to wear pants, but men must. Even if they are plain and transparent, skirts are required.

Athletes are not permitted to upload images from the field or backstage on social media.

There are some restrictions on the use of social media by athletes during the games. Photos and videos taken on the playing field or in backstage areas reserved for players and coaches are not allowed.

BMX riders are required to tuck their shirts in.

Even if they are wearing matching pants, BMX riders must tuck in their shirts.

Backflips are not permitted in figure skating.

Although cool, backflips are not permitted in figure skating due to the two-foot landing disqualifying them as a “jump.” Surya Bonaly, a 1998 contender, still managed to score one for the crowd in spite of this.

Wrestlers are required to carry a handkerchief.

Olympic wrestlers are required to keep a bloodrag—a hanky—somewhere in their gear. Yes, it is used to stop any bleeding from rival businesses.