Lie on a flat bench or floor with your knees bent at 90 degrees and feet flat. Hold a dumbbell in each hand above your chest with palms facing each other. Lower the weights out to the sides in a controlled arc with a slight bend in your elbows, feeling a stretch in your chest. Pause briefly, then bring the dumbbells back together by squeezing your chest muscles, maintaining smooth and controlled movement throughout.
Log your dumbbell fly knees at 90 degrees sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.