One thing I'd say is do things (where possible) at the same time. Eg when I work from home, 8-4, I have a 10 minute break in the morning, 30 min lunch and 10 min break in the afternoon. Instead of sitting chilling, I just go for a walk. All added up (10 minutes to eat lunch) is 40 minute walking during the day. So maybe means getting up a little earlier and getting it done before you start work, or do it after.