Two vital elements required for workouts.

• Position: Circuit training - YOUR LIFE

Since it can be difficult to fit strength and cardiovascular exercise into a workout regimen, Andy Fry, a fitness specialist in Indiana University's School of Health, Physical Education and Recreation, Bloomington, has a suggestion: try circuit training, which is a type of interval workout that combines endurance and aerobic exercises to create a full-body workout that usually lasts 30 minutes.

"Circuit training usually consists of eight to 10 exercises, with minimal rest in between," explains Fry. "The idea is to keep your heart-rate elevated the entire time, fatiguing one muscle before moving on to the next."

A circuit training session could consist of short intervals on a stationary bike or treadmill with strength exercises such as lunges or bicep curls in between. One also could create...