I need about twenty minutes of exercise three times a week.
我需要一周三次大约20分钟的锻炼。
He disciplined himself to exercise at least three times a week.
他规定自己每周至少锻炼三次。
Exercise at least three times a week (more often is even better)
每周至少运动三次（次数越多越好）
How often does he exercise? He exercises three times a week.
他多久锻炼一次？他每周锻炼三次。
I exercise three or four times a week.
我一周锻炼三四次。
We exercise three or four times a week.
一般现在时，主语不是第三人称单数时，陈述句中。
Then, we should exercise twice or three times a week.
然后，我们应该每周锻炼两次或三次。
Then, we should exercise twice or three times a week.
然后，我们应该每周锻炼两次或三次。
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