Concentrate on how your body feels. Now try focusing on one peaceful thought, or create a picture in your mind of a beautiful place. If your mind wanders back to the problem creating the stress, make yourself return to the peaceful thought and stay there for a few minutes. In the passive form one is barely paying attention to one's thoughts while in the active form you are paying attention, or being mindful of one's thoughts and surroundings at all times. Passive meditation is done to reduce stress, fatigue and bring about a tranquil state.
Active meditation is done to improve mental acumen, memory and performance.
Passive meditation is the form of meditation most people are familiar with and perhaps the easiest to perform. Unplug the telphone. Have a regular time each day in which to practice your meditation. Wear loose, comfortable clothing. Sit in a comfortable postion.