Problem: How does the next paragraph end?

How to control your treadmill workout using your heart rate
Take your pulse.
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.
A: 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.

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The man in the front has a horse with no rider following behind him. They are going down some cowboy trails enjoying the mountain views. they
A: are going slow and steady, not in any rush.

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How to get started in parkour or free running
Get in shape.
You must have endurance. Work on basic calisthenics like push-ups, pull-ups, sit-ups and squats.
A: These are the basic building blocks for practicing parkour. Experts say you should be capable of performing 25 push-ups , 5 pull-ups and 50 full squats before you formally get started in parkour.

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How to detect flea bites
Familiarize yourself with what fleas look like.
Fleas are very small insects. They do not have wings and are usually brownish or reddish in color.
A:
These insects have flat-shaped bodies with a mouth and sharp jaws. Their flat bodies enable them to move easily through an animal's fur.