I'm a SAHM who couldn't do it without a very supportive DH. He watches the kids so I can go to yoga/tai-chi 2-3x a week after he gets off work. He works out the other evenings (while I take DS to his tae kwon do class) and sometimes after I come back from yoga. It means that we rarely eat dinner together during the week anymore.

I usually have a weekend day for a long ride. I try to get short rides in during the week with DD in the trailer, but that's been difficult with DS home for summer vacation. He's only good for short spurts on his bike with lots of long breaks in between. Thankfully school resumes in a week. Also, now we try to plan family and couple activities that involve our bikes.

We do have a YMCA membership for the whole family, which is nice, because as Limewave mentioned they provide free day care for the kiddies. I try to get two circuit training work-outs in during the week but I've been lazy about that lately. Their rates are very reasonable IMO and the facility is nice (at least in my area - I have lived in communities where the Y was very ghetto) with enough equipment that there usually isn't a long wait for them. They offer a plethora of programs most of which are part of membership - spinning, swimming, pilates, nutrition, etc. Some classes do require an additional fee such as the various martial art classes and personal training sessions. Plus they offer various programs for kids of all ages and family programs. We keep meaning to take advantage of their parents night out. This is offered one night a month for parents to drop off their children for a few hours in the evening for a date night or something. Not all Y's have the same offerings, so if you're interested, check with your local outfit.

My other "work-outs" are during play time with the kids. DD is competitive by nature so she'll want to race while she's riding her bike and I'll chase after her on foot or on my rollerblades. We each have our own jumpropes and the kids will watch me and try to follow along. If the kids are occupied with their own activities and friends, I sometimes use that time to stretch or something. I probably look like a dork doing this in the middle of our apartment complex. Oh well, I don't fit most people's definition of cool anyway and I have learned to accept that. Not too long ago a neighbor commented on how athletic she thought I was. I have to admit that for this former couch potato and slightly less chubbier (though I'm still quite a butterball) person it felt good to hear.