householdames likerocter & gamble's tide pods. >> is small but mighty. i think i pareired up with them because it reflects on my gymnastics. >> small can be powerful. >> reporter: beforehe commercials and fame there was sacrifice, lots of it. forcing her to miss out on moments most teenagers cherish. >> ihought that like i was g out on public school a going to all the football games or prom or homecoming. but then once i think back to it i'm like, well, yeah, i can say i've missed a prom but i've been tohree worldhaionships and they won't ever get to say that. so i think it's a win-win. >> split and wrap good. she'sajor rock star. when you have people like mary saying she probably the greatest gymnast they'vever seen in their lives? that's a really deal. >> reporter: tonig she's one step closer toving that's the case. she's favored to win four more medals in the individual events. >> i guess what's on the line for her is it would solidify her as the bes ever. >>ter: in fact, she's just twoals away from becoming thmost-decorated american gymnast of all-ti