I am so unfit, it's not even funny...

My new job requires me to walk very often and I realized how unfit I really am. I would say I have a nice figure but my muscles are not really there. Especially in my arms. At the end of every work day, my feet and lower legs are in so much pain. But I was told I would get used to it so I high hopes. It's great that I can work and get a workout at the same time! I was considering to workout in the new year but I guess I am starting early. I am going to have buns of steel and awesome legs by the time 2013 rolls around.

What is your exercise routine? Any good tips that you can give me to build up lean arm muscles? Share them in the comments below.