Walks With Dad

When i was younger and lived w/ my parents, me and dad would take walks all the time, our route was around 3 mi and took us about 35 mins or so, during these walks we'd talk about whatever was going on in our lives, this was in dad's peak of losing weight, he lost over 75 lbs on weight watchers (he has since gained it ALL back & more) now he's walking again, but he gets chest pains on the hills, he's gotten it checked out & they say things are fine, but it scares him so much that he is afraid to walk. Hopefully, we can keep this going, its good bonding time w/ dad, and its good exercise too.