Your heart may need to work harder when your body requires more oxygen. For instance, if you are exercising, your heart rate increases to keep up with the muscles' oxygen requirements.
If you get a bad grade, you start to think that you are not that smart. It's OK to feel disappointed in your self sometimes. When you get a bad grade, it just shows you that you need to work harder in that subject.
Your Heart
Obvious answer your heart and your muscles need plenty of oxygen and if you don't have enough oxygen, your heart needs to work harder so you don't die.
As you exercise, the muscles need more oxygen to work. The heart beats faster to get the oxygenated blood from the lungs to the muscles. The harder you exercise, the more oxygen the muscles need, the faster the heart beats.
It increases it and causes the heart to work harder.
Because sometimes that persons life story encourages us to work harder to be like that person.
you need work harder, harder, harder.
It can be either an adverb or an adjective: In "you need to work harder", it is an adverb. But in "I wanted to do the harder tasks first", it is an adjective.
exercise strenghtens all the muscles in the body. the heart is one. the harder you work, the harder the heart works to pumo blood around to other muscles and that makes it stronger. the heart pumps the blood with oxygen to the other muscles that need it
Nope. Easier actually. Doesn't have to fight earth's gravity
guys sometimes work harder than girs
It pumps the blood quicker to get more oxygen to the muscles...