In French, you don't pause between each word. French-speakers will pronounce 6 syllables in a row smoothly, no breaks in between.
When speaking French, you put energy into the end of a group of syllables or a word group. You put noticeable stress on the last syllable to add emphasis. That stress indicates the end of the word, and helps you understand the word better.
You convey energy through your voice, but also with your body. When speaking French, you move on stressed syllables. The energy in the body is linked to that of the voice.
French-speakers often add a gesture to their speech patterns. The movement ends with the rhythmic group.
An easy way of spotting word groups is by watching how the body moves.