Rattling the Bones is a basic physical warm-up used by stage actors prior to a performance

Performance

A performance, in performing arts, generally comprises an event in which a performer or group of performers behave in a particular way for another group of people, the audience. Choral music and ballet are examples. Usually the performers participate in rehearsals beforehand. Afterwards audience...

 or rehearsal

Rehearsal

For other uses, see Rehearsal or Dress rehearsal A rehearsal is a preparatory event in music and theatre that is performed before the official public performance, as a form of practice, and to ensure that all details of the performance are adequately prepared and coordinated for professional...

.

Execution

This warm-up is performed by standing in a neutral position with the feet hip-width apart and the arms at the sides. The knees are bent slightly while the upper-body remains upright. Keeping the feet flat on the floor, the performer bounces rapidly in the knees while allowing their arms to go limp, in effect "rattling" the upper-body. The warm-up appears as though the performer is shaking their torso and arms.

The warm-up may be combined with releasing the voice in a low "uhh" sound while performing the "rattling". This allows for a combined physical and vocal warm-up effect.

The exercise is generally performed for 15–30 seconds at a time.