Lie on a flat bench holding a dumbbell in each hand with arms extended above your chest. Lower the weights outward in a wide arc with a slight bend in your elbows until you feel a stretch in your chest. Hold this stretched position for a set duration while maintaining control and tension in the chest muscles, then bring the weights back together in the same arc.
Log your dumbbell flat flye hold sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.