shaggyamy

It could be the type of work you do vs. the type of work he does.

I also work from home. I make sure to take breaks especially lunch. On my lunch I do some housework, laundry etc. That gets me up and moving. I also work out after work. I have a gym membership and the days I don't go to the gym I do some activities on my wii. Either Wii Active or Wii Fit

I'm not an expert but have you tried eating different foods than your norm or doing different workouts, stuff you haven't done before. Sometimes our bodies get accustomed to certain things and then a change in routine will get results again.