'This year’s Alien Fitness birthday party kicked off with our annual boys versus girls dance-off. The guys definitely got the party started with this epic Hollywood movie inspired routine!' 

Tags: fitness , gym , Dance , funny , performance , Party , movie , hollywood , theme , rosebud , alien fitness

SEE ALSO: kettlebell , Wellness Lifestyle , keeping up with the kardashians , Lifestyle , fitness blender , ab exercises , Katie , bodybuilder � � , por , lifting