He exercises less than an hour a day

锻炼───physical exercise;不到───Less than

A survey of the opinions of the students shows that two hours of physical exercise a day is acceptable in our campus.───一项关于学生意见的调查显示，我们学校的学生能够接受每天两小时的体育锻炼。

Hard physical exercise is usually looked upon as a specific weight reducer.───艰苦的体育锻炼常常被看作为一种减轻体重的特别方法.

Physical exercise conduces to good health.───体育锻炼能增进健康.

Be participating in physical exercise to improve their physique.───定是参加体育锻炼,提高身体素质.

Well, break dancing is more a physical exercise than a dance.───哦, 与其说霹雳舞是一种现代舞,还不如说它是一种健身舞.

Working hard is a great mental and physical exercise.───努力工作是非常好的精神和体能训练.

I'm not a great believer in regular physical exercise.

And remember the 10 benefits of regular physical exercise.

Each consisted of an hour's physical exercise followed by an hour's discussion.