Almost everything gets reduced. Length of warm up, number of drills/lifts, and number/distance of intervals is a good place to start. However, intensity must be at the correct level to keep the body stimulated to race. Also, the amount of rest should be increased. I like the 3 to 1 and then 2 to 1 method each week.
"Nature hides her secret because of her essential loftiness, but not by means of ruse." -Albert Einstein