1. I can do HN with the kids in the house and use my ears to supervise. I can't do that with exercise. (My son is right now sitting next to me, counting and recounting his allowance.)
2. I can comfortably do HN while it is too hot outside to exercise.
hm. a machine solves both problems; I mean, I don't have kids but most of the cardio I've done in the last 5 years or so has been on a machine; instead of watching children, I watch silly action movies. For me? it's to distract me from the monotony. Action movies were made for my attention span; but it seems you could just as easily supervise children.
That said, I certainly feel a lot more difference from resistance training than from cardio, and diet changes have been more effective than either in controlling my weight. (e.g. an hour a day of running is not going to keep me from ballooning out if I use mountain dew as my primary caffeine delivery mechanism.)
I mean, you can get a really nice treadmill for a grand and a half; by the standards of medical care, that's really cheap; Personally, I've also had some success using the manual type (which can be had for $50 or so on craigslist) unlike most other cheap cardio equipment (I utterly destroyed a rowing machine through a month of daily use... most low-end cardio equipment wasn't designed for actual use by a 200lb man.) the manual treadmills seem to be fairly durable. "I'm going to go push the shopping cart" I'd say. It does take a bit more concentration than an automatic, just 'cause if you stop, it stops, but eh, it's certainly usable, and you get a little bit of upper-body work done, too; it really is very much like pushing a heavy shopping cart.
This is a reasonable alternative, but I hate it because of the monotony. Taking care of kids involves lots of little interactions and quiet periods, so would not break the monotony. But perhaps I should look into getting a setup where I can do that while I'm on the computer, killing two birds with one stone.
Calisthenics can work well while watching kids. With no setup or teardown time, they work nicely for opportunistic, "hmm, looks like he's going to be occupied for a few minutes" holes in the day.
We also went running with a jogging stroller when the weather was nice. Our son usually loved the ride, and was asleep by the time we got home (bonus!). That might not work on its own with kids, but one of the places we went running was a local school with a track and a playground. I know the kids in this house consider a 30 minute visit to a playground far too short, and that's more jogging than I can handle.
I have done plenty of calisthenics. What I've found for myself is that while I am engaged in a workout routine, I'm really NOT available for child care, nor is it a good idea if unsupervised small children are near. Curious small children walking up trying to figure out what you're doing when you're about to, say, go into jumping jacks can be bad...
Families are different. I'm glad that calisthenics work for you in that situation. They have not for me.
For the record, my current lack of a regular exercise routine is temporary.
I understand. I'm not being critical of you -- just trying to help with what's worked for me in a similar situation. I mostly did squats and push ups, and the extent of my son's involvement was to add a little bit of . . . resistance . . . to the latter exercise. ;)
I understand the difficulty; when you're a sole caretaker, focused time to do things tends to be limited to naps and schooldays, and then it tends to be used for more system-critical things like taking showers. I hope your situation improves in time. :)
2. I can comfortably do HN while it is too hot outside to exercise.