Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to control your treadmill workout using your heart rate [title] Take your pulse. [step] If you don't have an individual heart rate monitor, you can take your pulse to determine your heart rate. To find your target heart rate, you must first determine the number of times your heart contracts (or " beats ") in a minute while you're at rest.

Ending1: [substeps] First thing in the morning is the best time to measure your resting heart rate. At other times during the day, your heart rate may differ in response to other activity. Ending2: More important than that is how fast your heart beats. When you're jogging, the number of beats you take in a minute form your baseline. Ending3: If you feel about 100 times your heart rate per minute, choose a target heart rate monitor to keep track of that number. [substeps] For instance, if you feel about 150 beats per minute, you're at about 100 beats per minute. Ending4: [substeps] For example, after a 3 to 5 minute exercise, take your pulse for three minutes. You are bound to get no more than this.

Answer format: ending1/ending2/ending3/ending4