For most sedentary americans the best activity to start a conditioning program is:

Walking.

Explanation:

A conditioning program must be started taking into account the specific goals and conditions of the person.

A sedentary person will have a hard time performing intensive and demanding activities, such as running, swimming or perform any kind of anaerobic exercises.

Taking regular and consistent walks will help him/her to gradually improve his/her body stamina, and be able to perform harder exercises.

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