I knew this word before. With two characters of "raise" and "life", this word means "to take good care of oneself" or "to improve one's health", such as to have a proper living style or to avoid drinking alcohol. However, I was surprised by two signs while walking around. One was to keep people off from a grass by saying the grass is under 養生, and the other was stood beside an elevator. Although it is possible to imagine the meaning for the former, but I see very little meaning about the latter. Apparently it is a standard use, indicates that some temparary protections were provided to an elevator, such as during a heavy use for a moving.
I believe that this interesting extension to this word reflects people's appreciation to the environment and to their tools.