I don’t think there is any evidence about force production in upperbody during sprinting. I just know one thing, that sprinting is not rowing or skiing (I doubt that even for these sports exercise like biceps curl contribute to overall performance). A beginner who does just few pushups, few dips and 0 pullups might need to think about increasing strength in upperbody through general strength exercises. If you are not beginner in overall strength like I showed then trying to increase strength in upperbody through isolation exercises does nothing. If someone believes that it helps recruit additional muscle fibres in leg muscles and increase RFD then it’s a good idea. Are we sprinting using special gimmick when our arms are attached with elastic tubes?