Foto guía:

http://prntscr.com/9ltxoj

Scoreboard: /scoreboard objectives add salto stat.jump

PARTE1:

/execute @a[score_salto_min=1,score_salto=1] ~ ~ ~ detect ~ ~-2.3 ~ wool 13 /effect @a 8 1 3 true
/execute @a[score_salto_min=1] ~ ~ ~ /scoreboard players reset @a salto

PARTE2:
/execute @a ~ ~ ~ /summon ArmorStand ~ ~ ~ {CustomName:salto,NoGravity:1,Invisible:1}
/execute @a ~ ~-1 ~ /fill ~ ~ ~ ~ ~ ~ barrier 0 replace air 0

PARTE3:
/execute @e[name=salto] ~ ~-1 ~ /fill ~1 ~1 ~-1 ~-1 ~-2 ~1 air 0 replace barrier 0
/execute @a ~ ~-1 ~ /fill ~1 ~1 ~-1 ~-1 ~-2 ~1 air 0 replace barrier 0
/playsound mob.irongolem.throw @a 0 0 0 9999 0 1

PARTE4:
/execute @e[name=salto] ~ ~-1 ~ /kill @e[name=salto]
/execute @a ~ ~ ~ /particle cloud ~ ~ ~ 0.1 0 0.1 0.3 2
/execute @a ~ ~ ~ /particle smoke ~ ~ ~ 0.1 0 0.1 0.3 5
/effect @a minecraft:jump_boost 0 0 true

PARTE5:
/scoreboard players reset @a salto


comandos de effect:
/effect @a minecraft:slowness 2 10 true
/effect @a[x,y,z,r=2] minecraft:slowness 2 10 true
/effect @e[type=Creeper] minecraft:slowness 2 10 true
/effect @e[name=Capullo] minecraft:invisibility 2 1 true

comandos detectar:

/execute @a ~ ~ ~ detect ~ ~-1 ~ minecraft:dirt 2 /effect @a minecraft:slowness 2 2 true