How tenacity helped a triathlete with rheumatoid arthritis "to not give up"

Whether it's the high of ultra running or the descent in aerial dancing, Reesa Partida is in it for the challenge. 

"I've always been a competitive person," Partida told CBSN, adding, "It's just fun to push myself to do better than myself. Not even better than other people, but I just want to beat my time from last year."  The California high school dance teacher has been racing since childhood, but these days, Partida is pushing the limits with triathlons and 50K trail races. As recently as Saturday, she ran the Bishop High Sierra Ultra 53K race in under six hours.