Question: What's the best full body workout for those under severe time constraints?
Answer: There is no one best workout for someone under time constraints but there are some good options. One option is to join a 30 minute boot camp where you have an instructor pushing you through various exercises and keeping your heart rate elevated the whole time. You will be working muscles and burning fat at the same time. Another option is to complete a full circuit in the gym. Try moving down the selectorized circuit and doing 30 seconds per machine with 30 seconds between exercises. This will take about 30 minutes and then finish with 20 minutes of intense cardio. Overall, the key is to keep your heart rate elevated by keeping you body moving through the exercises while working every muscle in your body.
We have a comprehensive "Basic 8" circuit that a personal trainer can go through with you for free, just being a member. http://www.snapfitness.com/basic8 This will work your entire body so you can get into the gym, get out, and get on with your day.