You could do a standing bentover arm press backward:
Stand with two dumbbells and plant your feet (weight in the heels); hinge forward from the hips keeping your abs strong until your trunk is almost perpendicular to the legs and almost parallel to the floor. Arms are extended straight down from the shoulder, palms facing each other.
Slowly press the straight arms back and up keeping them in the same plane until they are aligned with the trunk, then slowly lower them back down.
You can keep the palms in the facing-each-other position throughout this exercise, or you can vary the palm position by slowly turning them out / up until they are facing the ceiling at the top of the press, then return them slowly to the facing-each-other position as you return the arms to vertical.
HTH -
A-Jock