Lauren Conrad's trainer, Jarett, put together called the 20x3 Workout (you will need a jump rope and 3-5 pound weights)
Shape Up: My 30-Minute Workout - I must admit i have only done this once, but plan to do it again and on a regular basis...i know it works after the first time I could not walk properly for a couple of days! got to keep it up!
I just did this for the first time and man am I going to be sore in the morning. It says it's a leg workout, but it definitely works your arms and core as well. I can't do burpees because of my ankle and knee injuries so I did a one minute wall sit. Here's to hoping that in six months I have my sexy legs back.