i said cardio is exercise for heart and lungs- speaking less broadly, the better shape your heart and lungs are in, the better you can be at resistance training; you’ll have more stamina and faster recovery, and things in general will be easier to do (walking, stairs, keeping up with children). resistance training makes the rest of your body stronger, so that things in general get easier, like lifting things etc. you can get away with only doing cardio or only doing resistance but best to do a bit of both, i think. but you should also train a bit for flexibility.

you can run/row/elliptical yourself skinny (not without eating healthy) but you cant run yourself jacked, you need to build muscle. unless you’re a sprinter, i guess