Though Kirstie says she knows she shouldn't compare her body with others, she can't always help it. "We're not blind; we look around. We see what we want," she says. "I'm like...I could have those arms. ... I think I'm ready to work."

With her new motivation, Kirstie says she's confident she can lose the weight again. "It's sort of nutty, but I think I can do it. And if I do it, then that really is an inspiration," she says. She isn't necessarily planning to get back into a bikini in public, but Kirstie says she did see a dress recently she'd love to wear. "I thought, 'Oh, I want to have that dress on.' But you know, my whole issue is my butt and my legs."