Android - How to run only specific activities?

Working on my project I'm gettin annoyed everytime I run my app, it starts from the very beginning and I want to test/debug/check only the activity I'm working on.

I want to run the app and start at the activity that I'm working on

I found this: how to run Specific activity in android emulator?

Seems a good option, I'd like to know more ways to achieve what I want to do

• Android Studio 2.2.2

• Ubuntu 16.04 x64

• No emulator (yet), using real device

Thanks in advance