I guess you noticed most people are saying "How do we do it?!? We DON'T! How do YOU do it?" Or maybe "WHY are you doing that to yourself?"
But I think I know - you see that your kid enjoys something, so you knock yourself out to make it happen, if you have to move heaven and earth to do it. But I'll bet most of those other women dropping off those kids don't work, at least not as much as you. And most probably don't have a younger sibling, too.
Is there something you can find at his school? Some schools and daycares offer a Playball program which is carefully designed especially for young children. It's once a week for 1 hour - *that's* more typical of the after-school programs for that age group. (And no running around for you, since he's already there.)
If his school doesn't have anything like that, do they maybe have a "stay and play" program where the children have plenty of unstructured playtime as well as games and activites? That's what they really need at this age rather than structured, organized sports anyway. I know the City of Roswell offers some afterschool programs that are reasonably priced and don't take up 8 hours a week. You didn't say where you live, but check your local parks and recreation office - usually the price for local residents is 30% cheaper (since many of these programs are subsidized by through local taxes). You'll probably have to call them because it can be difficult to find the progam information online. Tumblebus, the Little Gym, bouncing around at a Monkey Joe's every now and then - stuff like that.
If you happen to be in Roswell, you can download the Fall program brochure here. Be patient, it's big.
http://www.roswellgov.com/index.php/p/394/t/Fall/Winter%#...
Sometimes it isn't even the parents pushing the kids - the kids push themselves to exhaustion. If he loves it, it may be hard to stop, but maybe he'll get tired of it by the time the season ends.
That's HEAVY load at any age, not just for the kids, but for the mom running them around. I think you need to scale back before your daughter gets old enough to start wanting extra activities or you are going to lose YOUR mind. When your life is constantly *that* hyper-scheduled, just one backed up toilet or flat tire becomes a crisis.
By the way, did you mean to say 14 instead of 4? I didn't realize they had programs like that offered for 4 year olds. And then you said something about "schoolwork" and "study time"? Isn't he in preschool? I'm wondering if you meant to type 14 because... this just doesn't make sense to me. No offense or anything.