The reality starlet, 32, who isn't showing yet at three months pregnant, wore tight black pants and a long-sleeved top for her workout.
West, 35, surprised his girlfriend of eight months when he revealed her pregnancy during his concert at Atlantic City's Revel Resort on Dec. 30. "Make some noise for my baby mama," he told the audience.
"I have felt good. I haven't had any morning sickness, but it still isn't the easiest," she told Us. "People always say it's easy and fun. It's definitely an adjustment learning about your body and stuff like that. I've been feeling really good so that's good."