Im more curious how her feet stayed on, At first I thought he held them on, and was heavier... Though I guess they are probably just attached to the pople somehow
There still has to be a level of trust.
Even if you've practiced a thousand times, if you lack trust in the people you're performing with you're likely to still make plenty of mistakes.
Can you imagine the number of **** ups it took them to get there ?
This is not only about individual skill, this is about complete synchronization. They must all have roughly the same weight (height too as a consequence).