The goal of this paper is to design and test an unmotorized ankle exoskeleton inspired by chimpanzees. The desired result is pronounced pelvic list movement more akin to that of a chimpanzee, increasing hip muscle activation. We believe that the combined stiffness of the ankle and midfoot could play a major role in regulating pelvic stiffness. An adjustable system using lead screws is used in the design of the unpowered ankle exoskeleton. Analysis is performed on the videos of the individuals walking with three different stiffness variations: normal, minimal, and maximum. Pelvic list movement and box plots with an IQR of 8.43, a range of 16.25, and a standard deviation of 4.75 suggested approximately 49.4% variation from usual walking without a device. We found evidence for our hypothesis that the chimpanzee-inspired design combining stiffness of the ankle and midfoot would influence the pelvic spine.