this is a practise world for bridging and block-in I made a long time ago for a server of mine(which is not a thing anymore) but I made it work on single player now(it is multiplayer compatible if the commands work on the server but you might need to switch out commands depending on the server type)

you will spawn in the lobby and to play block-in practise turn to the block-in button and click it then click get tools/blocks button and turn on the auto reset(by clicking on the leaver) then walk to the bed defence after block-in done click reset button and to play bridging practise click on the button for it(there are different lobbies for each bridging practise) lobby 1 a stone straight bridging practise, 2 a sandy straight bridging practise, 3 nether a diagonal bridging