Going to the gym or not has nothing to do with education. Exercise if you like. If you don't like it, no one else can drive you! Necessity? I'm advising you not to wait until you feel pain and discomfort before going to the gym. It's called exercise rehabilitation, not fitness.

Engineering refers to the research and application of materials science, computer, information, electronics, machinery, electricity, architecture, water conservancy, automobiles, instruments and other technologies and processes. Engineering or engineering is "applying the principles of science and technology to solve problems". Engineers bring science into reality through imagination, judgment and reasoning.