I agree with others who say you should not push yourself so strenuously. When My Dr confirmed mine at 4.8cm, up from 4.5 about 6-7 months later, she upped my BP med and recommended no strenuous activity. Light swimming, walking, biking, or anything that won't raise the BP. I have a follow up CT scan tomorrow to check the size. Grown any more or not. I must say- in the 6 months from 4.5 to 4.8, I had fallen on my chest and broke several ribs, so that probably contributed to the enlargement.
Best of luck