Cupping and Gua Sha are great for tight muscles and also for detoxing.

Cupping uses glass cups that are made into a vacuum using a flame, then quickly placed on the body (usually the large muscles of the back & shoulders).  This lifts up the whole area, flushing tight and stuck areas with fresh blood and releasing stagnant muscles.  When the cups are released, a wave of relaxation passes through the whole area.

Gua Sha uses a smooth implement to bring heat and blood circulation to the surface, while stimulating stuck and sore areas underneath.  It can be used for various conditions such as tight muscles or to ward off cold & flu.