Cardio-Strength Combo Circuit

This is one of my favorite workouts. I did this workout almost everyday of the week last summer after graduating college. I made it a routine after lab hours Monday-Friday and switched up to an hour of yoga on Saturday mornings and took Sunday off. Originally it is a celebrity workout, although I can't recall exactly which one right now, but I modified it somewhat. You do need a gym for this, however last summer, the closest/cheapest place I had to home was the YMCA--which can be literally grimy sometimes since its so affordable for family memberships, but if your goal is to look and feel great, just go and don't think about anything else except seeing results!
The workout entails alternating a few minutes of cardio with a few sets of strength exercises.
For cardio, I prefer to use the elliptical since its low impact because I have terrible knees and ankles. However, if you're multitasking and starting to train for a marathon or something that involves running, use the treadmill for your cardio routine.

10 minutes Cardio: 4 min at low intensity; 4 min at medium intensity, 2 min at high intensity/sprint
     The point is to raise the temperature in all your muscles and increase heart rate.

3sets20reps of each using 3-5 lb dumbbells. (Ladies, you have very little testosterone and you will NOT "bulk" up  if you use higher weights. If the dumbbells you are using are not providing any resistance and you are not feeling the burn, go for more lbs.)
     Lateral Shoulder Raises
     Reverse Flys
     Alternating forward lunges combo'd with bicep curls


5-10 minutes Cardio: Medium Intensity



2sets20reps of each--adjust weight on machine so that you feel the burn.
     Chest Presses
     Leg Presses
     Overhead Dumbell Extensions--Use a 5-10lb weight. These work your triceps. Maintain proper form by keeping elbows close to your head.

5-10 minutes Cardio: Medium Intensity


CORE

2sets25reps of Ball Crunches

3sets10reps of Reverse Crunches
1set10reps Planks--hold for 30sec each

2 minutes Cardio: Low Intensity


STRETCH STRETCH STRETCH. Hold your stretches at least 30 seconds each.