“…Solving these limitations, smartphone applications (apps) have been proved to be a valid, reliable and accurate alternative to traditional laboratory equipment for the measurement of several physical capabilities like vertical jumping (Balsalobre-Fernández, Glaister, & Lockey, 2015;Haynes, Bishop, Antrobus, & Brazier, 2018), barbell velocity (Balsalobre-Fernández, Marchante, Muñoz-López, & Jiménez, 2018;Pérez-Castilla, Piepoli, Delgado-García, Garrido-Blanca, & García-Ramos, 2019) or linear running and sprinting (Balsalobre-Fernández, Agopyan, & 6 Morin, 2017;Romero-Franco et al, 2017) thanks to the built-in slow-motion cameras present in current devices that can record at 240 frames per second. Moreover, the validity of some slow-motion apps has been confirmed in different populations like adolescent athletes (Rogers et al, 2019), old adults (Cruvinel-Cabral et al, 2018) or even professional Cerebral palsy players (Coswig et al, 2019). However, to date no app has been developed to specifically measure CODS performance.…”