Include the keyword or keywords that
you want to optimize the post for in the post body.
But do not over do it by just stuffing
the post body with keywords as this will be considered keyword spamming by
the search engines and also it will not make any sense to your readers.
So include keywords just in a natural way(2-3 %) to the point that
it makes sense to your readers and you will avoid keyword spamming automatically.
Bold your keywords only once or twice in
the whole body as search engines seem to give importance to bold words.
Also use different variations of
the keywords in different parts as far as possible
to give a natural look to keyword inclusions.