To fit in my workouts, i use the waiting around time. My gym has childcare - this was more important when the kids (4) were smaller, but even now, it's still useful. I schedule some of their activities - swimming lessons, for example, there, then the others can swim, too or go to the childcare room, and I can work out. When I have to tag along to their activities, I take my sneakers and other workout stuff, whether some hand weights or a tennis racket, and workout or run while they're doing their thing. Also, I joined a tennis team with most matches at night, so by the time for me to go, usually around 8 pm, everyone's settled and Dad just needs to put them all to bed.