LIKE AND SUB
/attribute @s minecraft:generic.scale base set 100
/attribute @s minecraft:generic.max_health base set 50
/attribute @s minecraft:generic.safe_fall_distance base set 50
/attribute @s minecraft:generic.movement_speed base set 0.5
/effect give @s minecraft:regeneration infinite 255 true
/attribute @s minecraft:generic.step_height base set 15
that is all and you can tell pretty easily what each one does.
Have A Nice Day