The omega-3's (EPA & DHA) found in fish oils help regulate cholesterol levels, this is normally why it is considered heart-healthy. Just make sure whatever brand you end up getting is enteric and (hopefully) lemon-coated so it doesn't have the fishy repeats.
On a side note, bodybuilders take MUCH more than the average dose than most people take due to it's joint lubrication qualities and toning properties. The usual dose is around 900mg of the omega 3's a day, which most swallowable fish oils will have you taking 1-3 a day of. But as I said, bodybuilders can take up to 10-20g of the stuff a day if they are well-into HIT.