Beside some good walking, you can look for healthier nutrition.
While I was playing high level sport, I was 10 kilograms overweight: my body required huge nutrients but I was giving him the wrong ones.
I started replacing pasta (I am italian) with raw cereals like quinoa, millet, raw/semi-raw rice. They have better carbohydrates and more fibers. Plus they give a lower glycemic peak, making you satiated for longer time.
I replaced meat with fished (and not "harvested") fish plus legumes.
In three monts (with lots of sport doing), but just changing my daily diet, I got rid of 10 kilograms.