Can anyone tell me what the purpose in doing cardio is exactly, with respect to weightloss? I'm sure there is a reason, I just was wondering if anyone could identify it for me exactly. I just don't like to takes things only on faith. Right now, it's not clear to me why one would want to do extra work (cardio) above and beyond strength training rather than just eating less.
Why don't people just eat less rather than doing cardio?