Pendulate

There is an old trick of suspending a shilling by a thread, and causing it to pendulate within a glass , so as to strike its sides , the thread being held between the finger and thumb .

Source: wiktionary

Watch a male in fight. He will pendulate over one spot for ten or fifteen minutes , then change his position and pendulate again .

Source: wiktionary

Lungarella and Metta (in Lungarella, M. and Metta, G. 2003) studies the role of changes in the qcquisition of primary motor abilities: learning to pendulate (to swing like a pendulum) or bounce. In the first case the study was conducted with a small-sized humanoid robot that learned to pendulate.

Source: wiktionary

What's important to realize is that you can pendulate—swing back and forth—between these sensations of expansion and contraction.

Source: wiktionary