Why always 5km?

See a picture of the area behind my house! It's just a series of interconnecting paths around and through parks. Each day that I ride I just jump on the bike and ride until I hit 5km ridden. I don't have a tonne of time to ride most days so short rides meandering around suit my schedule.

This will probably change closer to the end of the month, when I realise how many k's I need to catch up!