I TRAIN FOR SANITY, NOT VANITY!
Stay fit! Your health shouldn’t be treated like a competition or a beauty contest—it’s your life. Learn to believe in life-long fitness and health. You should have many reasons why you want to be healthy. Reasons that are close to you, not external reasons; such as hoping people would think you’re hot. When you have solid, internal motivation, staying fit for life is not a big deal nor a daunting task.
I stayed active even when I was broke, between homes, and so on. There are may reasons why I made fitness a priority. But the primary reason why was because I was able to maintain my sense of self and stability. A side effect of exercise is also a release of endorphins. I know staying active through those hard times helped me stay positive (read more on this here).
Once you have a number of years under your belt of being fit, you will get accustomed to how great you look. That is when having the right (deeper) reasons for prioritizing fitness, really come into play. Have strong reasons for why you continue to work hard and eat healthy. Beauty is one thing but your health should reign and you should not risk your health for beauty. Take time to learn proper training & nutrition principles and once and for all master your body & health.
In closing, short-term, vain goals are fueled by short-term motivation. If you really don’t believe in health, you will soon become one of many “has-beens”, or never reach your full potential.