The martial arts combat sport of Brazilian Jiu-Jitsu, also known as BJJ, is great for honing a child’s hand-eye coordination, social skills, endurance, agility, and overall strength. Some parents have asked is BJJ safe for kids? What age kids start BJJ? Or simply, is Jiu-Jitsu dangerous? The answer is Jiu-Jitsu and BJJ are not dangerous for kids as long as they have the proper gear and instruction. The age kids start training in BJJ martial arts greatly varies between the age of 3 and 9 years old. The best way to decide if your child is ready to start learning the art of BJJ is to consider their social maturity and willingness to stick with the sport.