This is considered help.
moved to the help section.
I think there's a code on SPC that rids fall damage.
I believe there has to be a plugin.
In single player commands, type without quotes "damage" to get any damage, "firedamage" to get rid of fire damage and "waterdamage" to get rid of water damage. Im not sure if you have spaces between [Water/Fire] and [Damage]
Assuming ur using a legit client, Zombe mod has a "cheat" feature that removes fall damage. Make sure you go to the settings file and disable allowfalldamage. This may be a bit buggy on servers using NoCheat. Read the readme he provides.
Log off just before you hit the ground, its a bug.