Maddie Challenges Gazelle to the Gravity Challenge It’s hard to keep up with the latest viral trend on TikTok, but the latest trend caught my eye because I felt confident I could actually do this one. It doesn't require an intricate dance or elaborate voice-over; it just requires one male and one female, and I had the perfect male in mind for the Gravity Challenge. The Gravity Challenge is spreading around TikTok after someone realized that men and women have different centers of gravity. I had to know if it was true. Ryan Glatt, a psychometrist at the Pacific Neuroscience Institute at Providence Saint John's Health Center, spoke with Shape.com and said, “Because women tend to have larger hips than men, they will have lower centers of gravity," he says. Men, on the other hand, tend to "have more distributed centers of gravity."