Question on Logging Exercise

This is a grey area - you would probably at base be lightly active, or you could bump that up to account for the walking to and from work as apposed to counting that as exercise, or you could count it as exercise. It is really more of a personal preference thing at that point. Just try to get an accurate measurement of your exercise or underestimate it on the website because overestimating your exercise and then eating it all back is one thing that throws alot of people off their goals.

I'd say if you're pretty active at your job, you already have a built in wobbly. If you keep your activity level at sedentary, you should count both the walk and the 30DS. The "circuit training, general" listing is pretty accurate for calorie burn for 30DS (compared to what my HRM tells me) so you can feel pretty confident with those numbers. If you want a little wiggle room with your walk, log it at a slower pace than you actually go (if you walk at 3.5mph, log it as 3mph). That way you're still getting the calories but don't have to worry about overestimates.

For MFP purposes you would be sedentary then log your exercise separately. I always thought I moved around quite a bit at work until I got a Fitbit Zip and realized even on the days I think I'm moving at work I rarely log more than 2500 steps during my work day.