Enum is a good choice for boolean type of fields except that it is treated as a string and not an integer. In this case I just want to set a column in the table to indicate whether the row is active (1) or not (0). I do not want someone to accidentally enter a 2, 3, etc. in the field.
alter table healthtemperature1 add column active_ind enum('0','1') not null;
Article on Enum