3. You will recover faster  If you do not exercise after surgery or while you're undergoing 
      radiotherapy or chemotherapy , your muscles will get weaker and weaker. The tissues that may be broken
      down by therapy will not be repaired as quickly as they should be. By exercising, you can help your tissues
      rebound and you can minimize any deterioration in your joints. You might also help prevent complications
      such as bone softening, blood clots and bedsores. And, not least, you'll get some relief from the boredom
     and depression that often come with being confined to bed.