Breath support is the basis for everything in singing. If you do it properly you should have zero tension in your throat. It’s also the reason you can make a sound in the first place because without moving air, there’s nothing to vibrate the vocal cords.
Winning the gold medal at the BHS international contest takes a lot of hard work-- the set has to be fun and entertaining, the moves must be well-choreographed and executed, and the singing has to be flat-out excellent. It is a singing contest, after all!