I don't have young children any more (mine are 13/16) but frankly when my 3 were little, I didn't go to work and when they were not in school the only exercise time was when they were in bed (ie night time). I now live in UT and I am frankly astounded by how the mums of many (many LOL) young children appear to have time for multiple exercise avenues. The mums are not working but they often have babies right up to older teens. Frankly I don't know the answer. I think you do really well to manage a job, young kids and any exercise that does not involve a babysitter or childcare. What about a trainer indoors? My answer is that I never did make it all work when mine were toddlers and I didn't even have a job to juggle. Is commuting by bike an option?