Okay, this if from FOX news, so it is not necessarily reliable as they have publicized some total false "cures" by celebrities and quacks and I can not vouch for the links at the bottom of the article.
However, the main text: exercise for Cancer Patients seemed unobjectionable although I cannot figure out why they would think your doctor had to be consulted before stretching. All my doctors encouraged me to stretch from day one.
Basically the 4 exercises are : aerobic exercise, strength training, balance and stretching
Anyway, here is the link to the article
4 kinds exercise help Cancer patients
I found exercise post TX really helped me recover.