one method I like is to push really hard on my commute home, only going home because I'm not a morning person and clothing drenched in sweat while at work is not something I enjoy much.
20~25mins of self torture.
I tend to like to stick to 35~40km/h and keep it there while torturing myself.
problem with most roads and trails around here is that you have to slow or stop a lot, so I prefer to set a certain speed and hold it, instead of looking at the average of my computer.