Highlining is a slackline discipline that is practiced at great heights, between mountains, buildings, bridges or whatever.
It is a great 2️⃣ challenge and a slackline discipline in which the mental game and mindset are far more important than the technical and 2️⃣ physical ability.
To really know what is highlining you probably have to try to stand on one or, maybe, if you 2️⃣ get to see quite decent slackliners crumble when facing this new context and challenge, you'll get a pretty close idea 2️⃣ of what it means for the one on the line.
This form of slackline provides an incredible adrenaline rush when tried 2️⃣ for the first time and has a great impact on the spectators as well.
With the exception of highline freesolo, where 2️⃣ the athlete is purposely unsafe, the highliner is permanently secured by a harness, attached to the main slackline line and, 2️⃣ at the same time, to a lifeline, called the backup.