'Whenever I go to a public club to workout, everyone stops what they are doing to watch me,' Karina said. The reasons are obvious. Can you imagine being in, for example, an aerobics class and seeing Karina's huge naturals bouncing up and down, barely constrained by her skin-tight leotard? 'I prefer to workout in private,' she said. 'It's not that I don't like the attention. I just want to get something accomplished.' In these photos and the accompanying video, Karina uses one of those new exercise balls that everyone is using. It looks great between Karina's legs, and we love the idea of her bubble butt bouncing on top of a big, white bubble. 'Whenever I do exercise, I get very horny,' Karina revealed. 'It makes me want to get even more sweaty!' Karina, there are millions of men who would love to be your workout partner.