WEEK 4: Timed Intervals are back! This week, you’ll notice the first two days have the same amount of work and rest times, and the third and fourth days have the same amount of work and rest times, that way you don’t get too bored. Friday is Tabata style, to go out with a bang! Work as hard as you can during the “work” intervals, and rest, sip water, take deep breaths during the “rest” intervals.