The only thing I have a real complaint about modern shoes, walking, running and anything sport, is when they make the sole about 2 sizes bigger than the shoe. We all know them. As a non-runner myself, I go for walking shoes. I assume you have healthy, ( no bunions, plantar fasciitis, flat feet or bone spurs) feet.
Historically I was in to footwear, from critiquing my mother's shoes when shopping, yeah for real, to footwear for skates, rock/ice climbing, mountaineering, cycling, motocross, and skiing. I'm sure I am missing something here but I think I have made my point, footwear is important and well worth the shopping.
A recent CF topic is something all but forgotten in sports shoes, sweaty feet. I've never seen a sports shoe that takes care of wicking away moisture and sports socks for the purpose are half the price of the shoes. Materials like leather are uncommon and I haven't seen any leather sports shoes in years. I wear a thin polyester fabric sock to wick the moisture away with a high end athletic sock that further draws moisture out and away.
Unless you have the drive of a runner, save your money on high end shoes, you're not competing and the fraction of a second to win isn't your goal. In fact if you have any decent shoes, go jogging for a week and reconsider. With all of my shoe choices, it's not that I have an aversion to exercise and sports, running just isn't my bag. My brother gave me a great book written by a runner and a pair of running shoes many years ago in hopes that I would exercise myself well. He really wanted to help me, I hadn't been diagnosed with CF. He sadly wasted his money, I ran for two weeks and enjoyed the new shoes, for shoes and gave the book to a friend.
My brother makes me look like a piker at 72. He exercises more hours than I am up each day. He believes that good health comes from eating right and exercise. I agree with him up to a point. CF athletes probably are in the same percentage as the general population. During the Clinton Presidency he was doing his best to implement an affordable health care plan. At a gathering of friends the host was ranting about the idea of affordable health care and my brother said "what the President should have said is, 'Okay, here's the health plan, get out of your Lazy Boy chair, exercise 20 minutes daily, quit smoking, drink in moderation, eat right, lose your flab, that's the plan' ". My brother wasn't wrong and I live in the healthiest state in the U.S., It's contagious when you have so much activity going on.
Running is solitude for most of us, ear buds not withstanding. I took my brother's message to heart. I had raced bicycles as a teen. It wasn't well organized but I was so thrilled at 16 to ride 100 miles from 6000ft over the Continental Divide (9600') down to 7200ft and back in the same day. I got on my bike again. Very low impact and if Iowa can prove that it's anything but flat, I'm sure there's enough hills for 20 minutes of cardio max.
Good luck, good fun,
LL