Riddle: I have two bodies joined together as one, and when I stand still something inside me runs and runs – what am I?

Introduction / Context:
This riddle uses a poetic description to point toward a simple time measuring device. It says I have two bodies joined together as one and when standing still I ran and ran. The puzzle is talking about something that does not move across the room but still shows continuous movement inside it. The learner must connect the image of two joined bodies with the idea of sand flowing under gravity. Such riddles test visual reasoning, association and the ability to relate poetic language to familiar objects.

Given Data / Assumptions:

• The object has two main parts or bodies.
• These two parts are joined together into a single unit.
• The object itself remains standing still; it does not travel.
• Something inside it runs and runs, suggesting continuous flow or movement.
• The answer is a classic physical timekeeping device, not an electronic gadget.

Concept / Approach:
An hourglass matches all these clues. It consists of two glass bulbs, often called bodies, joined by a narrow passage in the centre. When the hourglass stands upright, sand flows from the upper bulb to the lower bulb. The glass structure does not move, but the sand inside runs continuously until it finishes. This is why the riddle says when standing still I ran and ran. A wristwatch has internal movement but does not obviously have two bodies joined as one. A thermometer has two regions but is not usually described as two bodies and does not run in the same way. A battery provides energy but does not visually run. Therefore, hourglass is the most fitting answer.

Step-by-Step Solution:
Visualise an hourglass: two glass bulbs shaped like spheres or cones joined at a narrow neck. The two bulbs can be called two bodies joined together as one object. Fill the top bulb with sand and place the hourglass upright on a table. The glass frame stands still on the table; it does not move from its spot. However, the sand grains run continuously from the upper bulb to the lower bulb, matching ran and ran.

Verification / Alternative check:
Check wristwatch. It may have moving hands, but it is not naturally described as two bodies joined into one; it is one case with internal parts. A thermometer contains liquid that rises and falls but again lacks the clear image of two separate bodies joined. A battery contains chemicals but no obvious continuous running motion that people see. Only an hourglass has an entirely still outer body with a visibly flowing interior, and its two bulb structure matches the two bodies clue exactly. This makes it the standard and widely accepted answer to the riddle.

Why Other Options Are Wrong:
Wristwatch and thermometer both measure time or temperature but do not fit the literal imagery in the question. They are not normally talked about as two bodies joined together, and their internal motion is not described as running in everyday language. A battery is even further from the description, as nothing inside it is visible running. These options are reasonable distractors for learners who focus only on timekeeping and ignore the physical form described by the riddle.

Common Pitfalls:
A typical mistake is to focus only on the phrase ran and ran and answer clock or watch without considering the earlier clue about two bodies joined as one. Another is to think of human bodies running, which leads away from the idea of an object. To approach such questions correctly, match every line of the riddle with features of a candidate object. When you do that here, hourglass stands out clearly as the only object that fits all parts of the puzzle.

Final Answer:
The object with two bodies joined together that runs inside while standing still is an hourglass.