'It's what keeps me alive': Calgarian continues walking entire city post-heart attacks

Mark Shupe has 'been around the block' a few times to say the least. The 60-year-old Calgarian has a passion for staying active and regularly walks about 15 kilometres each day. He set a goal back in 2018 to walk every one of Calgary's streets within five years and he's well on his way to achieving the milestone.  "I used to run a lot and started having back problems when I turned 50 so it was a struggle," said Shupe. "But I decided to start walking and needed to find something interesting