The first month after MI, I was told to walk slowly ... but after 8 weeks of cardiac
rehabilitation we were asked to walk 6 KM in an hour, which is not slow at all.
When I left the rehabilitation and after an stress test, they fixed me a training HR where I have to be between 30-40 minutes every day, to achieve it I need a good slope in addition to walk as fast as I can.
By the way, they never mention that this will enhance angiogenesis.