1. Keep a routine (wake up on time, shower, eat breakfast, dress in work clothes, start on time, eat lunch, finish on time)
2. Communicate well with your manager and peers
Although the big downside to that is, it takes a lot of willpower to leave the house during the day because I have to get dressed to go out and get the mail.
Also, going for a walk during breaks is great, because you're probably going to be getting less exercise otherwise.