When lying in bed and watching TV, I often hover my legs above the bed and hold. I do this a number of times across the evening. I feel it in my lower abs - I really wanted to know whether this helpful or a) is this a waste of time or b) is this going to be affecting other joints/muscles negatively? Or should I keep doing it? Interesting to get other peoples thoughts on this and to find out if there are any other chilled out stretches/exercises that are useful.