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Martial arts training is a physical contact activity in which there is risk to the participants. Practice is frequently very physically strenuous and mentally and emotionally challenging. Participation can result in injuries or damages of any sort, including permanent disability, deformity, or death. Sometimes the risks are not even foreseeable by trained experts.
It would be wise of you to obtain the help of a qualified instructor and have a physician examine you and clear you for strenuous physical contact activity before you try any of these very dangerous activities. Always inspect the practice area, the equipment, your partners, and yourself for risks before starting. Your participation is voluntary, so if you see something that you think is unsafe you should immediately tell the instructor and decline to participate in that activity. Always work within your own limits.