>>2549916Physical activity is healthy, period. It's not just about losing weight or getting swole though those can be benefits. Our bodies are designed to be physically active throughout the day and it's good for you both physically and mentally. If you're trying to get some muscles, go walking with a heavy pack or carry weights or something, but even just getting out there is good for you.
If you have trouble keeping up with it, find an activity to drive your interest. My wife has depression and tends to get stuck inside due to the lethargy, and I have had some success with getting her an app called Seek that recognizes and documents plants and animals, and making it a challenge to try to record as many observations as she can like it's some kind of fucking real-life Pokedex. Geocaching is an option, birdwatching, I personally enjoy mushroom hunting and foraging like
>>2560240 said. Even in urban areas like city parks and weedy abandoned lots you can have fun identifying plants, shrubs and mushrooms