Stretching the side of the trunk and shoulder, paticularly the 'lats' (latissimus dorsi), the side of the chest and ribcage.
Side stretch. Get that opposite side inner thigh stretched too.
flexflexibilitystretchstretchingmobilitytrunkbackspinelatissimusdorsisidesidebendlaterallowribribsribcage
From Flexibility, Mobility, and Stretching
