Nikki Bella, the sultry brunette, dons skintight black tights for an intense workout. Her round, muscular ass steals the show as she squats, lunges, and twerks, leaving little to the imagination. Every move accentuates her booty, making it bounce and jiggle, a sight that's both mesmerizing and arousing. She's a sweaty, sexy mess by the end, leaving us wishing we were her personal trainer.