Stretch hands behind head.

A lie on spine, under waist put rolled towel, legs stretched, under head a stand of magazines, stretched hands up, wrists crossed  locked, low hands crossed on floor, with a  body stretching to head, hands are locked kept, as exercises doing as isometric as keeping pose stretched behind head a hands within 30 sec, after rest,repeat for 3 times.

Dynamic as stretch hands behind head, keeping loading for three sec, turning hands back, repeat for 15 times.