I think people who don't work in entertainment really underestimate how difficult the job of host is, and what skills you need to project personality on camera and still appear comparatively natural. And that's before you get to the relentless focus on women's appearances. Most women in the business are on permanent diets - if you see them IRL, this is very clear.
So try this: try standing still, looking into the middle distance as if you are looking at a specific person (who isn't there), delivering a piece of script without making it sound as though it's been rehearsed, remembering not to include al; the phatic gestures & words (waving hands around, moving head etc, and all the "umms" and "ahhhs" that we use all the time. Do that for an hour, while projecting the most charming and energetic aspects of your personality, but in such a way that you are fairly anodyne and contrlled, but don't look artificial or false. Ad keep smiling. Keep sucking in your stomach, back up. Oh, and stop moving your head and hands around.
But keep natural and appear approachable so everyone thins you're their friend.
And hit your mark. Know which camera to speak to (don't know what hitting your mark means? Get off the floor).
It's actually quite difficult, and those of you who diss on camera presenters really have no idea. You can not warm to a television "personality" but you have no idea of the skills required, even by those whom you don't like.