A theme that runs through this site it is that prayer is a much wider phenomenon than we have often thought. Or, to put it another way, we all pray a great deal more than we may have realised.
The group prayers which follow are an attempt to acknowledge the often-forgotten fact that we can pray with our bodies as well as with our minds. All too often Christians have come dangerously near to the heresy which says that the spirit is good while the body is somehow, if not evil, 'not quite nice,' or a distraction from God.
The Old Testament is very clear that humankind is a totality of body, mind and spirit: mind and spirit need a body through which to express themselves. The trouble only comes in when body and spirit are pulling each other apart in different directions; in a truly integrated Christian, body mind and spirit pull together in the same direction - towards God in love and worship and service.
We can use our bodies as a part of our prayer. If you cannot see these exercises as 'prayer in themselves', perhaps you can see them as 'ways into prayer'.