The cat camel can help increase thoracic spine (middle/upper back) mobility and is useful for warming up and protecting the spine. It accomplishes 'spinal flossing' - essentially lubricating it and preparing it for more strenuous activities.

 

The side plank primarily works muscles in your core. Itstrengthens abdominal and back muscles, particularly the transverse  abdominis, rectus abdominis, oblique sand quadratus lumborum. It also targets the gluteus medius and gluteus minimus in the hips, as well as the adductor muscles located in the inner thigh.