How does stepping outside the house change your life ?

I’m getting weaker and weaker mentally and physically because I’m not stepping outside the house. I’m basically sorrunded by 4 walls everyday and feels like I’m living more in my head internally than externally. It’s like I’m interacting with my own thoughts and it’s ruining my mind. I’m sometime feeling sick of using the phone using the same apps. It’s like I’m not evolving.