By Linda Buch (Part 2 in a series) Q:I NEED to spice up my cardiovascular workout because I am getting bored. Any suggestions? -- Stan McD., Fremont A: For those who are regular exercisers and ready to take it up a notch, interval training is your key to success.

To kick your workout up a notch and maximize your body's calorie- burning potential, try an interval-training program. Interval training alternates short bursts of high-intensity exercise with periods of rest, which allows you to work harder and longer.