Of course physical activity is good for you.
It can be fantastic for your mood, energy, range of motion, shape and tone of your body, breathing capabilities and more. Keep exercising! Just understand that - despite a large volume of persistent outdated information - exercise on its own has very little to do with weight loss.
How you live has to do with weight loss.
How you handle stress, how you practice calm connection to yourself, has to do with the life and health you're able to create.