"keep exercise" is correct and usable in written English.
You can use this phrase to talk about an activity or habit of regularly exercising. For example, "I'm trying to keep exercise in my daily routine."
Subjects were instructed to keep exercise logs.
Keep exercise light and moderate, and get plenty of sleep while on this 3-day cleanse.[8].
Keep exercise in perspective so that you actually do it and enjoy it, rather than fear it and avoid it.
Trying to lose weight with a partner can help you stay accountable for your actions, as well as giving you an extra incentive to keep exercise appointments.
You just have to keep exercising.
"They keep exercising their influence in subtle ways," she said.
Finding reasons to keep exercising is a universal challenge.
And there are no good studies investigating why people keep exercising.
"People with a high level of fitness going into pregnancy can generally keep exercising till the end".
Regular exercise makes a big difference; it keeps bones strong and older people who keep exercising fall over less and are less prone to fractures.
This combination of lightheartedness and a sense of community spirit may be exactly what you need to help you keep exercising.
