Double_Jump

/execute @a[score_Jump_min=1] ~ ~ ~ /particle cloud ~ ~-1 ~ 0 0.1 0 0.01 100

/effect @a minecraft:resistance 1 250 true

/effect @a 8 1 3 true

/scoreboard objectives add Jump stat.jump

/testfor @a[score_Jump_min=1]

1:/execute @a[score_Jump_min=1] ~ ~ ~ fill ~-1 ~-1 ~-1 ~1 ~-1 ~1 barrier 0 replace air 0
2:/execute @a ~ ~ ~ fill ~-5 ~-5 ~-5 ~5 ~5 ~5 air 0 replace barrier 0

scoreboard players set @a[score_Jump_min=1] Jump 0