Video prompt:  a calf workout routine that promises to help you build bigger calves fast. It involves performing 30 sets of calf raises, which can help improve the appearance of your legs and overall muscle tone."
Defect: Deformation (any reason involved with a movement)
Explanation: As the man jumps, his posture appears unusually rigid and lacks smoothness, creating a jerky, unnatural motion. Most noticeably, the muscles on his body continuously shift and deform, while his limbs also undergo strange, irregular shape changes. This combination of rigid movement and constant distortion gives his jump an unrealistic and unsettling appearance.