Hello @abbyd13, I'd like to add my welcome to @rubywitch67's. Ruby asked some good questions here. Was there any more explanation as to why you are not supposed to exercise? Were you referred to another physician or cardiologist to investigate the heart rate in more depth? Here is an interesting excerpt from Mayo Clinic's page on Bradycardia:

"Bradycardia is a slower than normal heart rate. The hearts of adults at rest usually beat between 60 and 100 times a minute. If you have bradycardia (brad-e-KAHR-dee-uh), your heart beats fewer than 60 times a minute. Bradycardia can be a serious problem if the heart doesn't pump enough oxygen-rich blood to the body. For some people, however, bradycardia doesn't cause symptoms or complications."

It goes on to say, "A resting heart rate slower than 60 beats a minute is normal for some people, particularly healthy young adults and trained athletes. For them, bradycardia isn't considered a health problem."
https://www.mayoclinic.org/diseases-conditions/bradycardia/symptoms-causes/syc-20355474
@abbyd13, in addition to Ruby's questions, did your provider mention the term bradycardia at all?