For those who have become familiar with the 6 Persona-types and who have begun to delve into Body-types or Biological Profiling related to these types, here is an analogy that may clarify things.

Imagine each Body-Type is a type of vehicle.

A Bilious body is much like a motorcycle, it goes fast, doesn't need to stop for traffic jams and can be a little dangerous for those who haven't learned to ride it well or choose to ride in risky ways. The motorcycle may very well be the first to reach the target but it may be a lonely ride and only a small amount of equipment can be carried along.

The Phlegmatic body is much like a truck. It's slow, especially going uphill, but is capable of carrying very heavy loads for long rides. As long as it follows a certain structure, it will get to where it needs to go but if you leave it to its own schedule you'll probably find it often at pit stops.

The Nervous body is much like a luxury car. It's expensive, nice to look at, it travels with comfort but it has to adhere to the given routes and cannot go off-road since any damage to it would be extremely dear to fix. Basically it performs perfectly only a given set of tasks but without adaptability. Though it will be among the first to reach its destination, it does so with much more focus on style than on adaptability or practicality.

The Sanguine body is much like a 4x4. Most of the fun is straying off the road into the unknown only to come back messy and disoriented. Though it can very well get from point A to point B, its purpose it much more oriented toward non routine tasks, fun and adventure than to the goal in mind and certainly doesn't want to stick to a boring route without having tried the various adventure tours first.

The Lymphatic body is much like a campervan. Never knowing what may lie ahead, all the resources are readily available for sleeping, eating, driving or camping. Because it weighs to carry all these resources, the campervan goes slow and steady along the road and must stay within regulated areas because of its size but will surely get to the destination with a certain degree of comfort while being ready to possible needs to camp out.

The Melancholic body is much like a bike. It would be the only mean of transportation (compared to the other 5) that has no power engine.  A trip might take a long time and result into a tiring experience but will give time to reflect, think and ponder on the surroundings. Also there will be no need for refueling.  It also means that the bike can be carried onto any other powered car and transported to another destination.  The biker will eventually reach its destination but will most likely do so very slowly and into a meditative state or with some kind of help from others.

Now that the body types have been illustrated, one can add the Persona types as drivers within the car. Imagine what a Bilious Persona would do with a Lymphatic Body? The Bilious driver would probably hate having to stay slowly on the road and follow the traffic laws and would tempt to speed, go off the road or in tight spaces only to have to stop to fix a broken engine or wheel.

What about a Sanguine Persona in a Nervous Body? The driver would most likely get easily distracted by social opportunities and would need to show off the car forgetting about the goal until the car gets aged and worn.

Once you get the hang of being able to identify Persona-types and Body-types, Profiling becomes a type of interweaved diagnosis. You can apply this to your self to understand what you natural abilities and limitations are or how you may optimize the use of the “mean of transportation” you were genetically given.