Containment was the name of the U.S. policy that sought to restrict communism to the places where it already existed.

In order to continue to improve muscle conditioning after muscle adaptation occurs, increased resistance needs to be added to the muscles.

The talk test is a simple way to measure relative intensity. As a rule of thumb, if you're doing moderate-intensity activity you can talk, but not sing, during the activity. If you're doing vigorous-intensity activity, you will not be able to say more than a few words without pausing for a breath.