https://www.reddit.com/r/loseit/
A community for weight-loss, primarily by means of inducing a caloric deficit.
I work from home at my computer and have two small children, my nearest gym is far enough away that a 60 min workout means being out of the house for 1h45m.
If I take the baby and the preschooler for a walk the furthest we can reasonably go before he's tired is 5K in around 65 minutes.
I have at my disposal a farm yard, some fields, old car tyres, tractor tyres and general bits of wood.
Any suggestions for how I can fit in some good regular exercise around work and childcare?
Not sure on your fitness level, but assuming you have a little cardio base built up: Flipping tractor tyres end over end can be a really good workout. You could also do that footwork drill for cardio where you hop your feet in amd on different tires. I think searching "crossfit tires" would give some other good ideas.
Also, the rural community I grew up in had a cycling community that would go on bike rides in the morning. Are the roads around where you live safe enough from cars to cycle a bit? Maybe that could be an option. Same for jogging.
As for finding time, really you're just going to have to choose a time and do it. Early morning workouts are the gold standard for people that work full time.
Maybe look I to some body weight exercises? I know the bodyweight fitness subreddit had multiple programs http://old.reddit.com/r/bodyweightfitness/wiki/kb/recommended_routine
I love https://darebee.com/ for all of their free body weight exercises. They have individual workouts and a bunch of programs that you can try. I personally like the programs so it’s less work for me having to pick out my workout everyday, plus some of them have fun rpg storylines.