Us in the Crossfit Community will often throw in a Tabatta routine when programming our workouts. If you're not familiar with it, its usually 8 rounds of 20 seconds of work, followed by 10 seconds of rest. You can use just about any exercise in the routine (ie. pushups, situps, air squats, pull-ups). I've also used it for sprints and rowing.
2013 "Frozen Red Edition" E92 M3, M-DCT with all the 'fixin's, Akrapovic Evolution w/CF Tips, BPM Stage 2 Tune, BPM DCT Software