There are a few things you can do to help you stay on schedule .
First is consistency. If you can identify a time where you can ALWAYS work out, arrange your schedule and priorities around that. For me, that's early in the morning. I try to start around 5am weekdays. It's before the rest of the household is awake, so I can get it done with before I have to get my son out of bed & ready for school, for example.
Second is accountability. Join a group that's also doing the same workout routine, and post daily about that day's workout. Go into detail about how you struggled, where you progressed, and how you felt before and after, and encourage others as they do the same. You can do that here, on the teambeachbody.com message boards, or other social sites such as Facebook. I run a couple closed Facebook groups for just this purpose -- message me if you're interested in joining.
Finally, you need to identify your motivation. Think hard about why you are working out, and be specific. Do you have certain goals? General health? Is there somebody you want to be healthy and fit for? If you can identify something that's important to you, you can remind yourself of it whenever you feel yourself flagging. It's also good to have short term goals -- training for a 5k/10k/Tough Mudder, losing 10lbs before the summer, getting in shape for your wedding, etc, but be prepared to set similar goals in the future so you don't just "stop!"
