短语讲解：

1. A group of researchers from a university in Canada recently published a study that says short bursts of high-intensity exercise are good for you.

be good for 值得，有效; 利于
例句：Do it up. It'll be good for you.
把它喝完，它对你有益。

2. In fact, this kind of exercise is just as good as spending up to an hour riding a bike or running steadily.

in fact 事实上; 实际上，其实
例句：They were in fact casual.
事实上，他们确实不修边幅。

3. That is because of the way the researchers organized the workouts.

because of 因为，由于
例句：John's jacket got out of shape because of the heavy rain.
约翰的夹克因为大雨而变形。

4. They did three sprints for a total of 10 minutes of exercise.

a total of 总数为
例句：Their expenses reached a total of 1, 000 pounds.
他们的花费总计1000英镑。