From my sitting spot in my kitchen overlooking my beautiful garden, I can briefly see my neighbors walking by on the street. One morning, I watched as one of my neighbors was walking her quite elderly Bassett Hound. She was using a flexi and as the Bassett walked slowly in a straight pattern (with his nose glued to the ground of course), his human walked in a zig zag so she could go at her own faster pace and get exercised.
I often get excuses from dog owners on why they can’t do certain tasks such as walking their dog properly: too hot, too cold, too tired, dog pulling, dog lunging or too excited, etc. All excuses with solutions.
I marveled that this person had found such a simple solution to getting her exercise and still incorporate her elderly dog. And I no longer feel that flexis should be outlawed 
With proper caution, that is actually a good use for them.
