When you kids are that age, you have to do it before they get up or after they go to bed. Spin bike at the gym is my option. My first organized ride of this year was a century in April. Because of my wife's work schedule and bad weather, I did not take one single ride on a real bike before the ride. In fact, because of projected bad weather I spent the night before the ride putting fenders on one of my bikes and getting it prepped for the ride. Every bit of training for that ride was done in spin classes and on stationary bikes at the gym. Talk about boring! Nothing beats going to the gym around 10pm for a 3 hour ride on a stationary bike!