In my worst period pre surgery (bilateral TOS both neurovascular) I could not walk for more than 10 minutes without having immense pain in my arms, even when keeping the hands in the pocket. I ended up basically doing NOTHING at all anymore. After two surgeries (one in June 2013, one in Dec 2013) I can now walk again painfree. Although, standing or walking the whole day long is still too much and I still need to lay down at least once a day for a while.