I exercise every evening: This is fine. I do exercise every evening: You need a determiner after "do" for this to make sense. For example: - I do some exercise ... - I do a lot of exercise ... - I do a bit of exercise ... As Dori said you can use it as a response to an accusation as well: A: You never exercise. B: I do exercise! Every evening in fact. You do see "take" used, but it's not that common (here in the UK at least). It sounds a bit weird to me, personally. It also needs a determiner. - I need to take some exercise. "Get" is more commonly used. I don't agree with Dori that it suggests different types of exercise. It could be the same thing (always running, for example), but it doesn't specify what that thing is. - I need to get some exercise. - I need to get a lot more exercise. You can also simply say: - I need to exercise. You always use it in singular form, in this case. Even if there are different types: - Pushups, sit-ups and running are three different types of exercise. Exercises is used to talk about drills, or practice routines: - Complete the following exercises as part of your English homework. - The military completed a range of naval exercises.

The first sentence is the correct usage. “I do exercise on occasion”, “ I take exercise very seriously”, “I get exercise when I walk to the store every day” if you say I do exercise every evening. You are trying to convince someone of the fact as if they dint believe you. Exercise is only quantifiable when you speak of specific exercises like push ups, bench press, sit ups are exercises.

Thank you!

I excercise every evening is correct. I get excercise every evening sounds like you excercise every evening but in different ways. Like a different type of exercise each time. I do exercise sounds like someone accused you of lying about exercising and you're saying I DO excercise! And then I take exercise is incorrect. Hope this helped :)