2. What is the main reason kettlebells have become so popular? They come in different colors.

They allow a person to more closely mimic real movement.

They come in a larger variety of weights.

They have a handle

"They allow a person to more closely mimic real movement:

the more fit you are, the faster the recovery. your heart rate drops most sharply in the first minute after you stop exercising; it should then fall about 20 beats a minute—a drop of less than 12 beats a minute is considered abnormal. this “recovery heart rate” is measured as part of an exercise stress test.