KevinR's story and encouragement is wonderful. Think of all those people who sit in a barcalounger doing nothing and have heart attacks. Sedentary life before and after their MI did not help them.

Hypoxia-Inducible Factor (HIF) whether from high altitude or lack of blood flow in subacute coronary occlusion stimulates angiogenesis (new blood vessel growth)

I have not had an MI but I send my orthopedist postcards from where I am not supposed to be, including Whitney and higher. You only live once - go for it.