There are many sports that can be practiced in a duel, but the best ones will depend on individual preferences and skill level. Some popular sports that can be played in a duel include:

Fencing: Fencing is a sport that involves using a sword to attack and defend against an opponent. It is a highly technical sport that requires strategy, speed, and precision. Fencers wear protective gear and use different types of swords, depending on the style of fencing. The three styles of fencing are foil, sabre, and epee. In foil and epee fencing, points are scored by touching an opponent with the tip of the sword. In sabre fencing, points can also be scored by hitting an opponent with the edge of the sword. Fencing is a sport that requires a lot of mental focus and physical endurance.

Boxing: Boxing is a sport that involves two opponents who punch each other with gloved hands. It is a highly physical sport that requires strength, speed, and agility. Boxers wear gloves and protective gear, and fights are typically divided into rounds. Points are scored based on the number and quality of punches landed. Boxing is a sport that requires a lot of training and conditioning, as well as mental focus and discipline.

Judo: Judo is a martial art that involves grappling and throwing an opponent. It is a highly technical sport that requires strength, technique, and strategy. Judo practitioners wear a uniform called a gi, and matches are divided into weight categories. Points are scored by throwing an opponent onto their back or pinning them on the ground. Judo is a sport that requires a lot of training and conditioning, as well as mental focus and discipline.

Karate: Karate is a martial art that involves striking an opponent with hands and feet. It is a highly technical sport that requires speed, power, and precision. Karate practitioners wear a uniform called a gi, and matches are typically divided into weight categories. Points are scored by striking an opponent with kicks or punches. Karate is a sport that requires a lot of training and conditioning, as well as mental focus and discipline.

Taekwondo: Taekwondo is a martial art that involves striking an opponent with kicks and punches. It is a highly technical sport that requires agility, speed, and precision. Taekwondo practitioners wear a uniform called a dobok, and matches are typically divided into weight categories. Points are scored by striking an opponent with kicks or punches. Taekwondo is a sport that requires a lot of training and conditioning, as well as mental focus and discipline.

All of these sports can be practiced in a duel setting, where two opponents face off against each other in a controlled environment. The rules and scoring systems may vary depending on the specific sport and the competition level, but the basic principles of skill, technique, and strategy apply to all of them.