Maybe you have time to make it to the gym, but you've only got 30 minutes to fit in a workout. Should you do weights or cardio? Upper body or lower body? Here's an all-in-one full-body blast that will get your heart rate up and keep metabolism humming for up to 36 hours post-exercise. After a five-minute warm-up of light to moderate intensity on a cardio machine of your choice, perform the following exercises back to back. Rest for 2-3 minutes at the end of the circuit, then repeat 2 more sets (for a total of 3 sets).

Try this workout two to three times per week with at least a day's rest in between workouts. On other days, per­form cardio of your choice, a different full-body resistance workout, a group exercise class, or a workout tape. With a little bit of pre-planning and willpow­er, you can make it through December without damaging your fitness efforts. Conquering the biggest holiday month of the year will make it all that easier to keep going and kick things into high gear once the New Year does arrive.

MS&F 
Dumbbell Squat to press
Hold a light to moderate weight dumbbell in each hand, palms facing for war, shoulder height. Stand with. toes pointing forward and feet slightly wider than shoulder width. Perform a squat, and. as you stand back up, press the weights overhead as in a shoulder press. The finishing position will be standing upright with arms fully extended overhead, in line .with your ears, palms forward. Repeat for1215 repetitions.

Push-Up 
Place hands on floor slightly outside shoulder width, fingers straight forward. Keep your core tight and your body in a straight line. Exhale as you push up and inhale as you descend. Control your body to the floor as you bend your elbows to 90-degrees by your sides. Push your body back up as a single unit. Repeat for 10-15 repetitions. Do these on your knees if need the exercise to be a bit easier.

Squat Hops 
Stand with toes pointing forward and feet slightly wider than shoulder width. Perform a squat and let arms swing back behind you. Reverse the motion with your arms, and as they swing past your sides extend them to overhead and reach, forcibly reverse the squat and jump into the air Land softly on the balls of your feet with soft knees and reverse the motion. Repeat for 15-20 repetition.

Walking Lunges 
Hold light to moderate dumbbells at your sides. With feet together and facing forward take a big step forward and control your body weight as you bend both knee and descend to the floor. Keep torso upright and look straight ahead. Before the back knee the ground, push up the heel of the front foot and toe of the back foot. Bring back leg forward in a large stepping motion and descend again. Repeat for a total of 12-15 repetitions on each side

Dumbbell Bent-Over Row 
Hold a moderate weight dumbbell in each hand at your sides, palms facing inward, while keeping the natural curve in your back, slightly bend knee and bend forward at the hips until your shoulders are slightly higher than your hips. Pull the weights up and in at your sides initiating with your elbows keep elbows tucked at your sides and squeeze shoulder blades together at the top of the at the top of the movement Repeat for 12-15 repetitions.