What activities should I avoid if I have a herniated disc?

Ones that cause pain. This is only in the acute phase. Over time, activity helps the herniated disc to heal. For example, if there are twins, one fat and one thin, the fat twin will have the better looking discs. Instead of thinking of activity as a problem, think of it as a solution!
Bending/twisting. Avoiding bending twisting, heavy lifting, straining.