Do you honestly feel that long distance triathlon (70.3 & Ironman) are healthy endeavors? I haven't met a triathlete who isn't either injured or just getting over an injury. Divorce rate and immune deficiency issues also are the tip of the iceberg.
Only if you train smart. Junk miles = family problems,lots of time training, injuries, and immune suppression. Probably 80% of people do this sport wrong, and it's sad because I hear bad stories from spouses and kids.