Ten Trips will work on your students' tossing and targeting skills. Great for large groups of any ability.
Have players form a large circle, at least 3 feet apart from each other. One player tosses a ball to each of the others in order. Catching player toss it back. Goal is to have a successful toss/catch to each player without drops. Once all have been tossed to, that is one point. Play continues until 10 points have been earned, then a new player is designated as tosser.
Update: we tried this recently and 10 points is too long for a single tosser. Consider have tosser change after shorter rounds such as one single successful round.
Adapted from ThePhysicalEducator.com