Recently launched Step by Step: 638 km for Pediatric Movement Disorders — a fundraiser and awareness campaign in honor of the 638 children enrolled in our Natural History Study for Hereditary Spastic Paraplegia (HSP), a rare and often progressive neurogenetic disorder. From now until June 1, our team — including researchers, clinicians, families, and friends — is collectively running 638 kilometers, one for each child in our study. All funds raised directly support our efforts to improve diagnos