$SWEAT is a new token generated by your movement. You can only mint $SWEAT by validating your steps through the Sweatcoin app. Currently, you can create $SWEAT only with your steps. In time, there will be more activities that create $SWEAT, such as swimming, gym work, cycling etc.
$SWEAT is native to the NEAR blockchain and needs to be bridged before it can be sent to Ethereum or any other blockchain. Never send your $SWEAT from the Sweat Wallet to an address on any other chain or you will lose it.