After sitting in one position in a car or kayak for over 2 hours, I start to get pain from my buttocks down to my feet . It seems to have gotton worse over the last year although I have been doing weight training/circuit training 3 times a week and yoga twice a week. It does not hurt doing anything else. There is no pain to touch. There is no pain to walk or run or bike. The pain goes immediately away when I stand up.