Have a Power Month
Know that you can do a lot in a month. Work out four days a week, doing 30 minutes of cardio (jogging, biking, walking, StairMaster), or work on your abs every day, plus two days of upper body and two days of lower body work.
 

Work It Out
Make the most of your time at the gym: Any kind of cardio activity, ideally one that incorporates the upper and lower body at the same time, is great. For example, there's a machine called the VersaClimber, which is a vertical climbing machine -- it's like a StairMaster with a feature that incorporates the upper body too.
 

Know Yourself
The best time of day to work out is whenever you feel best and when you're most likely to be consistent. If you're a morning person, hit the gym before work. But if you've ever considered hanging a sign at your desk that says "Don't talk to me 'til I've finished my coffee," an evening workout may be better for you.
 

Stay Hydrated
Drink only water while working out. If you must drink a sports drink, dilute it with one part drink to three parts water. If you drink sports drinks on their own, they're so concentrated that any vitamins or electrolytes you think you're benefitting from are actually going straight through you.
 

Feel Your Pulse Pound
Consider using a heart-rate monitor, especially when you're on a crash course to fitness. It'll keep you within your target heart rate!
 

Take Snacks to Go
Carry snacks with you. With so many things to do, you'll likely be caught without time to eat properly. If you tote around an apple, a banana, or an energy bar, you'll be less apt to scarf down a bag of chips in between errands.