NEED HELP ASAP AND WILL GIVE A MEDAL ***
Tammy is using a treadmill, and when she puts her hands on the bar, sensors read her heart rate. Today, the sensors are telling Tammy that she is reaching 183, which is the highest rate in her target zone. What should she do to get the most effective workout?

Increase her running speed without adjusting the incline
Use the machine to maintain or decrease her intensity
Do additional aerobic exercises immediately after the treadmill
Use the machine to increase the incline and intensity

Question

NEED HELP ASAP AND WILL GIVE A MEDAL ***
Tammy is using a treadmill, and when she puts her hands on the bar, sensors read her heart rate. Today, the sensors are telling Tammy that she is reaching 183, which is the highest rate in her target zone. What should she do to get the most effective workout?

 Increase her running speed without adjusting the incline
 Use the machine to maintain or decrease her intensity
 Do additional aerobic exercises immediately after the treadmill
 Use the machine to increase the incline and intensity

mathmale · Answer

This question is health and/or physiology-related, not math related.  
I do see that some of the possible answers here make more sense than do others.  
If Tammy's heart rate is at the high end of her target zone, and assuming that she's not aiming to change her target zone for now, then automatically one or two of the possible answers can be eliminated.  Which ones?