Follow these four easy stretching exercises to relax tired muscles and improve your flexibility. The best part is that these exercises can be done on a chair. All you need is yourself, a chair, and a little time!  Stretch 1: Open up Your Chest Toward the Ceiling Sit on the edge of your chair with your hands behind your head. Bend back, opening up your chest and elbows toward the ceiling. If you feel a stretch, you’re doing good! Return to a normal sitting position and twist toward one side, turning your elbows to the floor. Repeat for the other side. Stretch 2: Twist and Touch the Floor Twist toward the floor and release your arms to the side until they nearly touch the floor. Make a little semicircle with your fingertips till you reach the other side then slowly come back up. Roll forward to the other side …