As I get older I notice that I have to find ways to keep me motivated to go out on some days, or even to go on a hike. The thought and pleasure of a hike is in my head, I even do the planning, but sometimes I wobble and start to look for excuses as to why I should cancel. My excuse usually is my view about the travelling time involved, the thought of driving on a packed motorway like the M6, going to Penrith on a train, even worse on a coach, sitting in an airport or killing time on a ferry often depresses my enthusiasm to go.
I have overcome this by doing a 'deal' with my wife, if I waver, she gets stroppy with me or 'pushes' me out of the door in some other way. I will also sometimes get a Skype call from my son as well. Its always worked so far.
When at home, I have said for years that I must get out and about every single day! Again, my wife helps me to do this if I get into falter mode thinking. The most likely days for me to 'make an excuse' are Thursday's and Sunday's. Wednesday's and Saturday's are my evenings at the pub!
I've recently given myself a project, which I'm really enjoying, to record all of my off road running routes on my Wikiloc app. I've done 9 so far, 3 to go! That gets me out of the house without any trouble at all.