When we sit for along periods of time there is a lot of persistent pressure on the sits bones (ischial tuberosity) and the supportive tissue. It can get very angry even stuck. It’s important to bring some energy and movement to the area to stimulate blood flow through movement, massage and using your own body weight for gentle compression of the attachments. The Hamstrings is one muscle group that is hugely effected when there is stagnation or resistance in this posterior hip area.