@EarringsandLipstick it's brilliant that your dc get themselves up. Whenever I've tried and gone to an early morning yoga class, they all just sleep through their alarms. It's such a pain as I love to do those classes.
To the OP, i'm 53 with secondary age children (a SP). I do yoga classes 3-4 (or 5) times a week in the mornings, I do Caroline Girvan weights straight after work before sitting down. I walk around 16,000 steps a day - often with my dogs. I always walk rather than get public transport if possible. If not, I try to go places on my bike instead. Now the weather's improving, I'm more likely to ride my bike to work meetings than get public transport.
I used to run (which I loved) but my knees are too fucked now. I ran in the morning before the kids got up and loved it.
When I worked in an office full time, I used to cycle there and back. I would also go to yoga classes on my weekend or go for a long bike walk.
In the past, I was a member of a gym near work and used to go there in my lunch hours. (That's when I was running outside too I think).
I think it's important that you can fit exercise into your schedule - I've always done that, whether it was running at 6am, going to the gym at lunchtime. I've never been good at going out to a class or the gym after work as I'm too tired, but I can fit in a weights session while listening to PM on Radio 4 after work .