That said, the only thing about walking is that unless you are walking in the hills and mountains, it isn't much of a cardio workout (no heavy breathing/heart pounding)
A bike on the other hand will turn your heart into a beast because it just gets stronger and stronger.
I have a good friend who had a heart attack (a widow-maker) several years ago. After he left the hospital, he started walking. He then got a bike and started riding every day.
That's been a few years now and he is still riding between 5 and 40 miles a day.
He's one of the guys I ride with.
In fact, he's the fastest of the old-timers I ride with (he's now 74 and in great shape).
BTW, he didn't get fast intentionally. He just rides a lot and all of a sudden he discovered he was faster than everyone else...usually without even trying.
Cycling is very popular with old-timers because it's easy on the feet and legs. There are many clubs for old-timers. Needless to say, they are a handsome bunch of men and women.;-)
Thanks for the kind words and advice. You’re absolutely right- walking is a good start, but bicycling would be better. My heart can certainly use the workout, and I really need to burn some calories and lose some weight.
I’m 68, I had a liver transplant last year, and I’ve recovered nicely. But more is needed. I have stationary bike for winter and I need to use it more, but in warmer weather I need to get out.
Good health to you!