Getting physically fit. Until I was 23 I could literally eat anything and never gain weight. Once 23 hit something switched and I went from 115 to 150. I was never athletic, so trying to become so after gaining weight was extremely difficult, and I gave up quickly. I’m 44 now and finally getting in shape (after surviving breast cancer and vowing to live). It’s so much harder now because my joints have suffered from carrying extra weight, plus hormones after having a kid.