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Can I say,

(a) Walking is good for health / healthy.

(b) Walking is a kind of exercise (which is) good to health.
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I'd say the following things would be okay:

Walking is good for [your] health.

Walking is healthy.

Walking is a kind of exercise [which is] good for health.

Be good to your body.

"Good to health" and "good for healthy" are not used.

Best wishes, - A.
Comments  
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Can I modify a gerund?

As your example, is this OK?

Everyday walking is healthy.

Everyday walking is good for health.

thanks no end....
Anonymous Everyday walking is healthy.
Everyday walking is good for health.
These are fine.

I suspect most dictionaries have a separate entry/listing for "walking" as a noun.

I don't know offhand if there are cases in which gerunds may not be modified. I tend to think not.

- A.