Well, the only one I can't name at least one real world equivalent is the discus one, but there are plenty of magazines about sports that involve throwing like baseball, football or basketball so it's not that much of a stretch thematically (unless you meant something completely different).

Skill magazines are already pointless +1 items, except the archery one since it's more common than bows.  Books are good, magazines not so much.  ;)

These additions are complete fluff, for the sake of variety rather than gameplay impact.  You can easily raise throw to 1 by throwing 15 stones 1 square away. You need to get attacked about the same amount of times to raise dodge.  Swimming is something like 1% per move in deep water.  The only useful one is the FA mag since bandages/kits are limited.