Answer: It intentionally tries to promote happiness
Answer:
Carbon dioxide
Explanation:
Because The heart pumps the oxygen to the muscles that are doing the exercise. When you exercise and your muscles work harder, your body uses more oxygen and produces more carbon dioxide.
Your body language, since the question is asking for an action.
:)
<span>Ab Roller Evolution is made of metal. It supports neck, head and upper body during workout. It is an upper body trainer: works chest and core. You can do push ups, sit ups, dips. By providing improved support, it reduces stress and strain on body.</span>
<span />Description above is from Amazon.
It is a good idea but has some problems with its design. There is no way to secure it on the floor during exercise. So it moves around when pushed against and would not provide support. A normal crunch will likely work out better.
