Is the daily, 9-5 office schedule the reason for those pounds around the waistline? Sitting behind a desk all day puts you at high-risk for an unhealthy lifestyle, especially when you're dealing with all those extra business lunches, snack attacks when stress levels run high, and only a ten-minute break to get up, walk around and stretch.

If you're not an early riser for the gym each day, or are wiped out after a day at the office, making the best of lunch hour may be the only way to squeeze in a workout. Consider these simple exercises for a real power-hour over lunch:

1. The Stairwell Calorie-Burner.
Head to the stairwell for a quick lower body workout that's sure to kick the metabolism into high gear. Walking up and down stairs at a steady pace can give your glutes, hamstrings and calves a quick aerobic fix, improve circulation and even elevate the heart rate for a mini-cardio routine.

2. The Parking Lot Circuit.
Head to the office parking lot for a speedwalking routine up and down the lanes. Just steer clear of traffic as you weave in and out of parked cars; this routine can help increase your heart rate and take those energy levels up a notch.

3. The Hallway Power Walk.
If the office building has long hallways, consider trekking across the buildings and departments for a quick power-walking session. Just maintain a steady pace as you wave to fellow coworkers. You can also use this one as a way to greet departments you otherwise would never see.

4. The Lunchtime Lift.
If you can get to a local gym or fitness center, try a quick weightlifting routine that targets core muscle groups in the arms, legs and back. Even 15-20 minutes of focused lifting can elevate the heart rate, boost the metabolism and ward off hunger for hours afterwards.

5. Jog Around the Block.
Grab those running shoes and change into your workout gear for a quick jog or run around the block at the office. If the office has a workout room, even better. Just jump onto the treadmill for a quick 15-20 minute cardio blast that will help clear your mind, reduce stress and keep you focused for the rest of the day.