Any type of movement could be considered a ‘workout’ to some degree. Even a 5 minute walk can be called a ‘workout’.
Even though it is very low intensity and duration, it’s still some form of work beyond just resting.
In order to make a real change in your muscle size and strength you need to be ‘training’ and not just ‘working out’.
Training requires a plan, a timeline, a goal, and specific exercise intensities.
Unless you’re following a program with all of the above elements built into it, you’re most likely just working out and not really ‘training’.
P.S. Check this link out of you’d like to see an example of a well designed workout using body weight training.