How do you practice body blocking?

As I'm sure many of you are aware not very many QM opponents are willing to be body blocked and I've been having trouble finding ways to practice this against AI. The single lane Try Mode that you can use with every hero doesn't help much either, as Arthas is the only hero you can fight and he regularly has his Frozen Tempest active making you slower and infinitely harder to body block. The only alternative I can think of for body blocking bots is the custom game mode option.

If you have any suggestions on how to do this so I can practice it regularly I would love to hear it.