Care about yourself because nobody will. Health, sport activities, self-development and even learning new stuff needed for your job is only your own responsibility. For companies and managers you are just a machine without a soul writing a code.
Never be a patriot of any company and never try to do more then you are asked in any company if you don't have a legal ownership in it. You can be a great designer or an engineer, share whole your personality, creativity, ideas, you can try to help company grow, improve processes and everything else. The fact is, owners don't care about it, they will just ignore you, will follow only their own vision, politics and they always think they know how to do things much better then you in everything. Just save your time, energy and use it on self-development or creating own business instead.