This mod brings Paraglider which is an item in the game called LoZ: BotW.
The Paraglider can be crafted by using some leathers and sticks. While the Paraglider is on your hand, it will reduce your falling speed and negates fall damage. And you can glide over the land just like BotW.
Note that Paraglider will not work on left hand slot.
This mod is coremod, which means it manipulates Minecraft's source to implement things. This mod uses coremod functions to raise hands when gliding.
I guess this would not make any problem, but it can cause major crash or inconsistency with other coremods, because it is coremod and that goes.
Please let me know if you see some errors/crashes.