The thing abour riding, at least for me, is once I've started and gotten past the but-toughening stage, I don't need motivation. Riding is energizing and improves my mental health. So I make a deal with myself ... get on the bike x # of days for x amount of time, regardless of how fast or far I go, and I get to buy something totally frivilous that I want but wouldn't normally spend $ on.Make the rides "no pressure" rides, you will ramp them up on your own anyway. Figure out what kind of reward will work for you to get you out and riding long enough to get to the point where it starts to feel good, that's all you need. It's literally addicting once you get past that rough patch.