Dancing-

Burns tons of calories, you can get free videos on YouTube, and you can have fun while you're doing it. You can also learn new dance styles you never would have tried otherwise.
Housework-

Ok not exactly fun, but something you have to do anyway. Get really into it, listen to music and dance around while you're doing it all. Do some bigger tasks like cleaning out all the cupboards and stuff too, have a spring clean all the time.
Walking-

--- find pretty places in your area on Google, and walk to a couple of them each week. there are hidden beauty spots everywhere. A nice lake you can walk around, or pretty forest somewhere there are even urban woodlands too.
---Borrow a dog, or walk your own dog more often.
--- Go on romantic walks with your partner or on fun walks with friends.
Bike riding-

Bring back some good memories and the joy of cycling as a kid. It is fun once you get into it. Set yourself challenges like riding a certain distance and going further each week, or getting there quicker each week. You can also commute on a bike and kill two birds with one stone.
Kids-

Your own kids, friends' kids, nieces or nephews, kids can be fun. Go let loose and run around a park with the kids for a while, play football or teach them to climb trees. It's burning calories, improving fitness and making a kid smile all at once. Seriously, kids can wear you out! Try it.
Make up competitions that nobody else knows they're competing in-

I sometimes compete with people when I'm walking to work. I make sure nobody walks past me and I try hard to catch up and overtake people walking ahead of me. Gets me walking briskly without much effort, and makes me happy in a petty way that I "won" the walk race to work or home.
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1Opinion
Maybe the stairs challenge, where you run up the stairs trying to beat the lift. Obviously above the third floor is more difficult.
This is great advice on how to get fitter, good myTake.