Hive is a fork of Steem. Your keys will let you log in, but it is a separate chain and separate wallet, you should change your Hive keys.
ActiFit automatically post to both chains, if you go to your profile you can see them under “all posts.” You will need to reblog them for them to show on your profile.
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Okay thx yeah just saw it was also in my steemit blog popping up, it took some minutes. Ok makes more sense know. But why not post then on both platforms? Is there a drawback for not changing your keys? Already see Hive is more active comunity as Steemit seems bleeding...