How do the fingers typically appear during an upstroke when handling the bow for violin and viola?

During an upstroke in bowing technique for both violin and viola, the fingers typically appear arched and curled. This positioning allows for better control and flexibility in the bowing process, facilitating smooth transitions and articulation. The arched shape of the fingers helps maintain a relaxed grip while still allowing the musician to exert the necessary pressure on the strings to produce a clear tone. Additionally, this posture aids in the fluid motion required for string crossings and dynamic changes, making it essential for effective bowing technique.

Other finger positions, such as flat and straight or extended and elongated, would not offer the same level of dexterity and control needed for nuanced performance on the instrument. Pressing the fingers down against the bow would hinder movement and may lead to tension, negatively affecting the overall sound and playability. Thus, the arched and curled position is key to achieving proper technique in bowing during an upstroke.