@waitingformytakeaway can you get a small trampoline, rower or treadmill that you can use while watching the TV? There was a thread on mini trampolines recently, they're fun to run on.
I fit in exercise by doing the same as my kids - I have to take them & wait, so just join in (6hrs of tae kwondo a week!). I love it though - there's quite a few of us 50+ parents, so don't feel out of place, there's camaraderie & a real sense of achievement, plus I can do the splits again now, from all the stretching.
Also started parkrun each week, to try to improve aerobic fitness, plus 2 morning YT workouts a week & usually a Sunday Les Mills session (I love group fitness, the choreography challenges my brain).
Doing less now than before Covid, was never smaller than a chunky size 14 so don't dare give up as I don't want to reduce eating!
I see it as an investment in my future - heart health, osteoporosis prevention, joint flexibility & strength, plus balance improvement (and, apart from parkrun, I enjoy doing it all).