Dangerous Things To Be Avoided

When Jigoro Kano devised judo, he based much of it around practicing things that you could train to the fullest. That is, you can't blast someone in the head with an elbow in training because you will hurt them. You can train an armbar without hurting anyone. Granted, in the 1880's Kano was limited by the non-existence of protective equipment.

Today, we have much protective equipment, but there are still some moves that should be avoided or outright eliminated from training. Consider neck cranks, for example. These locks were used quite a bit in jiu jitsu about a decade ago and have pretty much disappeared. There is a good reason for this: a broken neck or spinal injury is hardly something a person can bounce back from.

When people train, they train primarily for health, fitness and exercise. Yes, there is a competition component and a self-defense component, but most people train because they want an active hobby. Is it really worth the risk to injure yourself severely over a hobby. Additionally, if you are a sport competitor, would you want your career to go up in flames over a serious freak injury? This is why you don't see serious competitors play around with these types of submissions.

Again, you want to play safe and have fun. There is not reason to injure yourself or your opponent.