The body is required to be inside a coffin or a combustible container. This allows the body to be quickly and safely slid into the cremator. It also reduces health risks to the operators. The coffin or container is inserted (charged) into the cremator as quickly as possible to avoid heat loss. Some crematoria allow relatives to view the charging. This is sometimes done for religious reasons, such as in traditional Hindu and Jain funerals, and is also customary in Japan.