A technique in which the muscles are stretched by an outside force is called Passive Stretching
as you pump more gas into the balloon, the particles become more packed, in an attempt to gain more room, the particles push on the walls of the balloon, therefore, making it expand.
In the question "Which of the following is a common human relations mistake?" The correct answer is "Misjudging others' abilities<span>"
The other answer options "Saying thank you when somebody does something nice" and "Taking responsibility for mistakes" are all good human realation practices.</span>