What does interval training usually involve ? a. sets of rapid exercises that get progressively longer. b. sets of fast exercises that get gradually slower. c. sets of slow exercises that get gradually faster. d. a combination of running, swimming, and jumping exercises.

Which of the following accounts for someone who has had regular herpesvirus-mediated cold sore or genital sore flare-ups? a) re-infection by a closely related herpesvirus of a different strainb) re-infection by the same herpesvirus strainc) copies of the herpesvirus genome permanently maintained in host nucleid) copies of the herpesvirus genome permanently maintained in host cell cytoplasm