Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to work out heart rate zones [title] Calculate your maximum heartbeats per minute by subtracting your current age in years from 220 if you are a man, and from 226 if you are a woman. [substeps] For example, if you are a 30-year old man, subtract 30 from 220. Your maximum heartbeats per minute is 190.

Ending1: If you are a 40-year old woman, multiply 190 (and 220) by 220 to get 40. [title] Determine how much blood you need to gain. Ending2: If you are a 40-year-old woman, subtract 40. [title] Multiply the number of breaths in your chest by the number of beats in your heart. Ending3: You can also visit a doctor or health-care provider to have them calculate your maximum heart rate using different tests. Methods of testing may include a stress test or exercise tolerance test on a treadmill. Ending4: [title] Calculate your maximum heart rate by subtracting any macro (internal or external) information. [step] Example: a man has 120 beats per minute and a woman has 140 beats per minute.

Answer format: ending1/ending2/ending3/ending4