I don't know of a reason why they have to. I know hundreds of highly skilled martial artists that cannot do a cartwheel.
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no. just high enough so you can get your head under the rest of your body. it's common sense!
Given clearance by your doctor, there should be no problem. Contact fighting may be off the list, but you can still participate in martial arts.
The equipments for getting complete martial arts training depend upon the type of martial art you intend to master. The typical equipments are Samurai sowards, Nanchakus , Plain Escrima Sticks and Karate equipments. This is a complex question that mainly depends on what form of martial arts you intend to train in. For a striking art such as Muay Thai, a suitable punching bag, striking pads, and sparring equipment will be needed. For a grappling based art, investments should be made in things like judo mats so that throws can be done safely. Mixed Martial Arts use all of of this equipment as they train in every aspect of combat; striking, throws, and grappling.
It is impossible to know any martial art in anyamount of time. Besides you do not need to know several martial arts. If you find a martial arts that suits you and train, train and train, then in 3-4 years you should be pretty proficient at it. Everyone who studys martial arts are always learning. If anyone says they know a martial art, they are either lying or have a massive ego.