Precor CONSOLE P80 - Manual (Page 41)

Introducing Users to the P80 Console
39
 As you work out, your perspiration will help transmit your
heart rate signal. If you have difficulty using the handheld
grips to determine your heart rate, try the sensors again
later in the workout to see if you can obtain a heart rate
signal.
 If the touch heart rate feature does not work for you,
Precor recommends that you use a chest transmitter
strap.
Figure 10: Heart rate target zones
CAUTION: Your heart rate should never exceed 85% of your
maximum aerobic heart rate. Your maximum heart rate is equal to
220 minus your age.