You are riding more than I am! My kids are 4 and almost 8. I make spin class one morning a week and then try and ride for 90 minutes on the weekend. That's quite literally all the spare time I have right now. I'm already getting up at 4 AM every day. Most mornings I run or walk for 45ish minutes. I run because I can do that outside in the dark--I much prefer to exercise outside than riding a trainer or going to spin class. I think it's just that stage of life . . . I do try and take the kids for bike rides but those are clearly for their benefit and is more valuable as "family together time" rather than "me getting in a workout" time. DH and I occasionally get a babysitter so that we can go mountain biking.