Check out Cassey's Video! https://www.youtube.com/watch?v=AW6TZVwP-FA New Merch Launched! null Cassey and I investigate the biomechanics of butts. What activates your butt muscles more, running or squatting? How effective are bridges as a butt workout? How much can we change the shape of our bodies with exercise? Huge thanks to Dr. Rowley for having us invade his lab for the day! You can check him out on facebook here http://www.facebook.com/kmichaelrowley If you liked this video check out these collaborations: What stretching actually does to your body ft. Sofie Dossi https://www.youtube.com/watch?v=1JgBp7dX4AU Why this skateboarding trick should be IMPOSSIBLE ft. Rodney Mullen https://www.youtube.com/watch?v=yFRPhi0jhGc http://physicsgirl.org/ http://twitter.com/thephysicsgirl http://facebook.com/thephysicsgirl http://instagram.com/thephysicsgirl Dr. Rowley's thesis on figure skaters: https://www.ncbi.nlm.nih.gov/pubmed/25775364 Sources: Sports and Gluteus Maximus Size: 'The cross-sectional area of the gluteus maximus muscle varies according to habitual exercise loading: Implications for activity-related and evolutionary studies' https://www.sciencedirect.com/science/article/pii/S0018442X15000761 Meta-analysis 1 'Twin study of genetic and environmental influences on adult body size, shape, and composition' https://genepi.qimr.edu.au/contents/publications/staff/CVPV080.pdf Meta-analysis 2 'The Beneficial Effects of Physical Activity: Is It Down to Your Genes? A Systematic Review and Meta-Analysis of Twin and Family Studies' https://sportsmedicine-open.springeropen.com/articles/10.1186/s40798-016-0073-9 Meta-analysis 3 'Variability in the heritability of body mass index: a systematic review and meta-regression' https://www.frontiersin.org/articles/10.3389/fendo.2012.00029/full Creator/Host: Dianna Cowern Editor: Levi Butner Research & Writing: Dianna & Imogen Ashford