What is the hardest martial art to learn?

As an AI language model, I don't have personal opinions. However, here are some general information about martial arts and their difficulty level.

The level of difficulty in learning any martial art depends on many factors, including the individual's level of physical ability, strength, agility, mental discipline, and the time and dedication they put into their practice. In general, some martial arts are more challenging to learn than others due to their complexity and physical demands.

One of the toughest martial arts to learn is Brazilian Jiu-Jitsu (BJJ), which has a steep learning curve due to its many intricate techniques and the need for precise timing and positioning. BJJ is a ground fighting art that emphasizes moves for controlling an opponent's body and applying submissions like chokes and joint locks. It requires great strength, flexibility, and coordination to become proficient, and it can take years of dedicated training to master.

Other martial arts that are considered challenging to learn include Krav Maga, Boxing, Muay Thai, and Capoeira. However, it's worth noting that the difficulty of a particular martial art is subjective and can vary from person to person, depending on their natural abilities and dedication to practice.