Holly, my fiancé, has gone away for two weeks. That means I'm solely responsible for cooking, cleaning and looking after four children and a teenager on my own. It will be the longest I've had to do this for. But a disruption to many of your usual daily routines can be an opportune time to create new ones. So I'm going to spend the next two weeks putting into practice what I know about routines and habits to get back on track with my health and fitness.