The first group exercised daily for 60 minutes.

VOA: standard.2010.03.30

and breaking a sweat for 40 minutes, 60 minutes a day.

每天出汗40分钟或者60分钟。

激情生活 - SpeakingMax英语口语达人

and breaking a sweat for 40 minutes, 60 minutes a day.

每天出汗40分钟或者60分钟。

激情生活 - SpeakingMax英语口语达人