'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: mr. , Cali , burlesque fitness , core , Lizzo , sixpack workout , Chicken , K pop , fitnessm , Kettle