Guide me, I just want to music and parkour!!!!!!!!!!!!!

Recently, I saw a YT video of a person playing minecraft.

The interesting thing is that he is doing long relaxing parkour (which seems too simple, like small consistent jumps).

I am a beginner, I just want to do the same with music on to relax and enter in flow state.

The problem is this video listed the map, but it's says without parkour. I don't understand it.

How the hen, did he generated all those ramps (mid air) ...................I am totally new to the game itself.

Please can someone guide me on this, will be a great help.

Here is the video ss.

See those cross golden platforms, when i download the maps it's not there (from video description)