Krav Maga

Training
Although Krav Maga shares many techniques with other martial arts and is itself a blend of boxing, Muay Thai, judo, and jujutsu, the training is often quite different. It stresses fighting under worst-case conditions or from disadvantaged positions, for example: against several opponents, when protecting someone else, with one arm unusable, when dizzy or against armed opponents. Krav Maga emphasizes rapid learning and the retzef ("continuous combat motion"), with the imperative being effectiveness, for either attack or defensive situations.
Instructors emphasize two training rules: there are no rules in a fight and one must not injure oneself or one's partner when training. Training is an intense mixed aerobic and anaerobic workout, relying heavily on the use of pads in order to experience both delivery and defense of strikes at full force. This is important because it allows the student to practice the technique at full strength, and the student holding the pad learns a little of the impact they would feel when they get hit. It can be almost as taxing to hold a pad as to practice against one. Students will also wear head guards, gum shields, groin protectors, shin and forearm guards, etc. during practice of attack/defense techniques, so that a realistic level of violence may be used without injury. Some schools incorporate "Strike and Fight," which consists of full-contact sparring intended to familiarize the student with the stresses of a violent situation.
Training may employ a speaker system blasting loud music, stroboscope and/or fog machine, meant to train the student to ignore peripheral distractions and focus on the needs of the situation. Other training methods to increase realism might include exercising the student to near exhaustion before having to defend, training outdoors on a variety of surfaces and restrictive situations, wearing a blindfold before being attacked, etc. The emphasis is on attempting to simulate real fight/attack situations as realistically as possible within the safety limitations of training.
Training will usually also cover situational awareness, to develop an understanding of one's surroundings and potentially threatening circumstances before an attack is launched. It may also cover "Self Protection": ways to deal with situations which could end in fights, and physical and verbal methods to avoid violence whenever possible.
A typical session in a civilian school is about an hour long and mixes conditioning with self-defense teaching. As levels increase, the instructors focus a little more on complicated and less common types of attacks, such as knife attacks, hostage situations and defense under extreme duress. First, the instructor will run a very intense drill to get the class's heart rates up. Then, after stretching, the instructor will teach two or three self-defense techniques. In the beginning the techniques will either be combative (punches, hammer-fists, elbows, and knees) or grappling (breaking out of chokes or wrist-grabs, getting out from under an opponent while on one's back). After that, the class usually moves to a drill that combines the techniques just taught with an aerobic technique. Lastly, there is the final drill intended to burn out the students. Depending on the class, this drill may be at the very beginning or at the end of the class.