The only tech job that had that balance was a network engineer at the headquaters of a global company in a skyscraper with 3 offices and a datacenter in walking distance. Most of the time I was sitting around writing code or configs, but at least once a week I would have to walk to a different floor or building to wire up a switch or rack a new DNS server or whatever. That bit of required physical activity and interaction with others was always a highlight.

Actually the only job without all those problems (err,any problems?) is to b a fitness instructor or personal trainer; not on an extreme level,8h a day, but let say you have 2 clients or maybe 3 clients a day, this would be enough movement / workout to never ever run into these problems, I guess?