Crossfit addict dying from lack of exercise after Capsulectomy. Lower body exercise acceptable? Is Yoga ok?

It would be wise to receive clearance from your surgeon before beginning any strenuous activity. This would include yoga. To do otherwise may place you at risk for bleeding and the subsequent recurrence of capsules. 

I am all for getting my patients back to their normal routine after surgery, and this includes the resumption of exercise. The type, duration and intensity of the exercise allowed depends on many factors. Every plastic surgeon has their own guidelines for resuming exercise, depending on what they are correcting and the techniques they employ. I have included a link to a paper I wrote on exercise and breast augmentation. It is a good general guide; however, it cannot serve as medical advice without knowing all the details of your procedure. The bottom line is, every patient needs to check with the plastic surgeon they have chosen for the best answer. You've chosen them for their experience and results. Following the correct aftercare regime is an important part of that process.

Dear Flieshome,every plastic surgeon has his own postoperative protocol which he recommends to his patients. I would suggest you to discuss this with your plastic surgeon.Daniel Barrett, MD, MHA, MS 
Certified, American Board of Plastic Surgery  
Member, Am. Society of Plastic Surgery

should always be cleared with your surgeon since your surgeon is the one who is going to have to deal with any problems should they result from you activities.  May patients can do toning exercises that do not involve bounce, straining, or use of chest muscles as my implants are 95% under the muscle.

Your plastic surgeon will always be your best resource when it comes to returning to specific activities. Having said that, lower body exercises should be completely acceptable.  In my practice, I encourage patients to continue most upper and lower body exercises (even in the presence of encapsulation).  Again, best to run this question by your plastic surgeon. Best wishes with your upcoming procedure.