Interval training involves alternating periods of moderately intense exercise that last one to three minutes with short, more intense exercise periods lasting from 30 seconds to a minute.

CNN: Is a shorter but harder workout better?

The Serbs' maneuver was made the more diabolical, however, for its being cloaked in the garb of a legitimate exercise of democracy -- a proposition calculated further to undermine the prospects for unified Western action during the interval.

CENTERFORSECURITYPOLICY: The Moment Of Truth: The US Must Stop Serbian Aggression Now