Do we actually think Lauren Conrad does this or does she simply not eat?) That said, it looks like a good workout as long as the room is empty . Treadmill Interval Workout -- Shape Up: How to Do a Workout in 30 Minutes
The Average Girls Treadmill Workout Chart : if you have a hard time with treadmill interval workouts that tell you to run at "speed 9 at incline for 4 minutes," try this workout (including warm up and cool down) designed for the beginner runner.
This infographic easily demonstrates a treadmill interval workout. This information was created by fitness trainer, Jay Blahnik.I have got to try this, may alternate between this and hill intervals to "spice" it up!