... spread and stretch exercises. IntroductionSitting along with the back leaning,may extend the back muscle,exercise the muscle of waist.And let ... your body up slowly,train your muscle of adbominal,the back board supportyour body,can let you make adbominal exercise easily ... strain and tiredness, train you abdominal muscle freelyJust lie your back on the chair , the exercises start .Spread your arms and ...