Organizing your exercises into a routine that gets results the fastest and the most efficiently is the holy grail for anyone who works out.
When my main exercise focus was weightlifting, I had developed a routine where I inserted a set of 10 squats in between each exercise: bench press 3x10; squats; lat pull down 3x10; squats; etc.
This was very good for me, as it increased my aerobic capacity without adding too much mass.
Now that I am focusing on bodyweight exercises, the search is on for the perfect fitness solutions.
One way to organize your routine is to break it down by body part and work them out in sequence: chest, shoulders, core (stomach), legs, arms, lungs (aerobics).
The order may vary, so that one person starts with chest, another starts with core.
Or, you can cycle through the body parts, so that it goes chest-shoulders-core...
and then repeats chest-shoulder-core...
This has the advantage of hitting each body part multiple times but giving them a chance to rest between workouts.
However, most people who use bodyweight exercises as their exercise of choice tend to view the body as a whole unit, rather than as different body parts or sections.
Exercises are chosen that work the entire body.
For example, spiderman pushups hit the chest, shoulders, hips, core, and lungs.
Romanian deadlifts work the thighs, lower back, balance, and buttocks.
So organizing the exercises into a cycle of body parts might look artificial, when the goal is to continuously be working the body as a whole.
Bodyweight exercises also can be used to achieve a specific goal, even more easily than other types of exercises.
It is relatively easy to switch a bodyweight exercise routine around to lose weight, tone up, build muscle, or increase flexibility.
It is much more difficult to switch a jogging routine from weight loss to muscle building, or a weightlifting routine from mass building to flexibility.
So what is the "perfect routine"? It may sound trite, but the perfect fitness solutions are the ones that work for YOU.
The number and variety of bodyweight exercises makes it simple to adjust your routine, even every day! Changing up your routine frequently has the advantage of keeping the body under stress - GOOD stress - without breaking your body down.
This will obviously be different for each person.
It will also change for YOU from time to time, as your needs change.
The exercises that worked for you at 20 probably won't be as effective at 35.
Writing down your various routines will help.
And using various experts to take suggested routines from will help