An activity involving physical exertion and skill that is governed by a set of rules or customs and often undertaken competitively. b. often sports (used with a sing. verb) Such activities considered as a group: Sports is a good way for children to get exercise.
Rust is Iron Oxide. Hence, any warnings concerning the ingestion of iron may apply. Ingesting too much iron, whether it be via rust, suppliments, or otherwise, can lead to unpleasant symptoms including nausea and vomiting. Long-term side affects such as liver damage can be associated with excessive iron intake.
Rust is just iron and oxygen. It just means that your pot was exposed to air. It won't harm you. When you use that pot anyway, you are leeching off small amounts of iron-and iron is one of those elements we need to function. Maybe on an visual level it looks a little gross, but you should be fine.