The Shakti mat (also known as an acupressure mat) is a modern user friendly "bed of nails".  The concept is based on the 5000 year old Vedic Indian tradition now infused with scientific design.  This article looks at how the mat works and the benefits associated with regular use

What is yoga about?  What are the benefits? What should you expect in a yoga class?  Lynda Miers-Henneveld from Yoga Unlimited provides a outline of yoga practice.

While you can practice yoga without a mat, a mat is useful piece of equipment to make your practice safer and more effective.  Mats can help to brace you so that you do not slip and fall when you are in a stance.  They also provide padding for knees, hips and backs in different positions.  So which mat is best?