9 Exercises You Can Do Without Getting Out of Your Chair

5. Turns 

Advantages: the case works 

How to do it:

• Sitting in a chair, put your hands behind your head. 
• Leaning forward, you should touch the left knee with your right elbow. 
• You will feel your abdominal muscles contract. 
• Return to an upright position and then repeat, lowering your left elbow to your right knee. 
• Work up to 3 sets of 10 reps.