every seconds:
	loop all players:
		level of loop-player is less than 100
		if loop-player is sneaking:
			the block below loop-player is not air
			add 0.7 to level progress of loop-player
		add 0.1 to level progress of loop-player

on respawn:
	level of player is less than 100
	wait 1 tick
	set level of player to 100