I started back swimming when DD was 9 months old - I joined an early morning lane club in the school next door to the college I was going to for 8 months, as I had to be in early (before 8.15am) to get parking but classes started at 9.30 and we'd gather as a class at about 9ish. So I'd go next door, worked my way up from 4 lengths to 50, but also got a hot shower and could dry my hair in peace away from milky spits and whinging baby. I generally swam 3 days a week.
When I went back into the office, I stayed at the club for another 18 months (timings worked) and then moved office location so commuting pattern changed. I joined a gym near the new office with a pool, continued to swim 2-3 mornings a week and slowly got brave enough to tackle the gym itself.
I literally last week pulled out of that, as I haven't been getting there over the past year as much as I had been. (I was going at least twice, and sometimes up to 4 times a week- but I've been once in Sept, once in Dec, once in Jan and this morning). Between my work patterns changing, DH's commuting and changed travel, losing our au pair, and just too tired, it was too much to add back in.
DH's job is moving offices from the city centre to 10 minutes walk from home. DD is grumbling about never going swimming anymore (we gave up lessons in favour of a different sport she wanted - she's a good swimmer). The gym in the local hotel is decent, pool is nice, hours are fine, kids are allowed, and the cost for all 3 of us is not much more than cost for me alone in city centre. So we have joined there and I will go swimming Sundays with the family, and gym one night a week (or maybe a second).
I also have a set of handweights that I use at home, for arm exercises. And do a lot of "plank" and situps to target my tummy.
I'd love to find a yoga class I can commit to - I did a sunrise yoga last autumn which was lovely (6.30am, and then head to work) - but I couldn't motivate myself to rejoin last spring when it restarted (not offered between Nov-early Mar). But I am working on trying to get back some decent level of fitness.