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Neither Sandra nor Marissa.
- Target heart rate is generally expressed as a percentage (usually between 50 percent and 85 percent) of maximum safe heart rate.
What is heart rate?
- Heart rate is the number of times the heart beats within a certain time period, usually a minute.
- The heart rate can be felt at the wrist, side of the neck, back of the knees, top of the foot, groin, and other places in the body where an artery is close to the skin
- The resting heart rate is normally between 60 and 100 beats a minute in a healthy adult who is at rest.
To know more about target heart rate here
https://brainly.com/question/1155838
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