How to Define Mass as How Hard It Is to Push When You're Sitting on Your Couch

Einstein for a while used this concept of relativistic bass and it was taught in textbooks so people who were told like your mass increases as you approach the speed of light that's not wrong it just depends on what you mean by mass. Now we think it makes more sense to describe mass as how hard it is to push you when you're sitting on your couch and to leave momentum to absorb all the messiness i guess you're saying like mass? I see. kind of depends on whether you define mass as howhard you are to push when you're just sitting onyour couch or how hard you are to pushed at any point or no matter how fast you're moving, he says