I started out 7 months ago walking a half mile a day, and I got increased nervy tingles in my arms from it. I persisted, and increased slowly. The last few weeks I've been logging up to 18 miles per week, and I walk with my arms bent in a power-walk, almost 4 miles per hour. I do get some increased nervy arm pain after a mile or so, especially if its colder outside. I googled walking and hand swelling and found it to be common, due to restricted circuation, so I open and close my fists alot while I walk and grab a frozen o.j. can when I get back home...but I still walk. I've found that if I push too much and walk too far I get more pain the next day, but if I'm inactive and skip walking a day or two I get increased pain. Balance is key with TOS.