1. You have to work out regularly.

2. You have to exercise regularly.
3. You have to do exercise regularly.
4. You have to do exercises regularly.
5. You have to take exercise regularly.
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Thank you for your help.
Are all the expesions grammatical? Do we have to use 'do exercise' or 'do exercises'?

#s 1 and 2 are the best. The rest are grammatically correct, but have those extra words in there!

=)

Yes, all of the expressions you provided are grammatically correct. However, there are minor differences in their usage. Let's break it down:

1. "You have to work out regularly." - This sentence implies engaging in regular physical activity, typically at a gym or fitness center. "Work out" is a common phrasal verb that means to exercise.

2. "You have to exercise regularly." - This sentence is more general and doesn't specify a particular type of exercise. It can include activities like jogging, swimming, or attending fitness classes.

3. "You have to do exercise regularly." - While grammatically correct, this sentence is less commonly used. It's more common to use "do exercises" instead, as in the next example.

4. "You have to do exercises regularly." - This sentence emphasizes the need to perform specific exercises or a set of exercises regularly. It implies engaging in a structured routine with predetermined exercises.

5. "You have to take exercise regularly." - Though grammatically correct, this particular phrase is less commonly used and may sound somewhat less natural compared to the previous examples. It implies a more deliberate and intentional approach to incorporating exercise into your routine.

In summary, all of these expressions are acceptable and convey the idea of engaging in regular physical activity. The choice between "do exercise" and "do exercises" depends on whether you want to emphasize a general exercise routine or specific exercises within that routine.