How to get up 2 block high heights

[JP1300]

How do you do it?

I've seen someone names KLUTZNCUTZ do it twice in a row
I tried breaking the block and jumping repedeatly, but only to get kicked by nocheatplus

 

[Roseria]

your not allowed to do that and that guy needs to be watched ... block glitching is not allowed

 

[CandyFTW]

Lock?

 

[KingJr]

You see, to get over 2 blocks, some people like to use MAGIX, it's not allowed tho, so don't do it c:

 

[Jtzink]

Its block glitching. Which is against the rules. Locked