One of the things that helps me with my exercise is to actually plan or schedule it into my day. For instance, I exercise after work on Monday, Tuesday & Thursday. I know if I don't do it as soon as I get home, I wont do it. On the weekends I usually do my exercise around the same time as weekdays (e.g. 3:30 or 4:00 which is about when I get home from work).
As everyone knows, schedules change all the time...so I'm not always able to follow the above schedule. I do the best I can....