Copy the paragraph exactly. Take it in phrases, not letter by letter.
WPM
0
Accuracy
100%
Time
00:00
Errors
0
Progress
0%
Every cell in your body runs on tiny structures called mitochondria. They take sugar and oxygen and turn them into usable energy. Muscle cells that work hard, such as those in the heart, contain far more mitochondria than cells that rest most of the day. Training increases their number, which is one reason exercise makes daily effort feel easier.