Back-to-Back Twist Pass
Kneel or stand back to back, twist to one side and hand the ball off while your partner turns the opposite way to meet it, then send it around the other side. It is a rotation drill for the obliques that needs no throwing skill at all, which makes it ideal when one partner is nervous about catching.
Kneeling is the harder version because the hips cannot help; standing lets a newer partner use the legs and turn more comfortably. Keep the turn slow and controlled, and reverse direction every ten passes or so, so both sides get the same work.
