Vickie,
Adults sometimes have difficulty with games, until they realize that they actually learned something from it. Keeping students engaged by physical activities is always an effective strategy. I have found it often doesn't take too much to get students refocused. I use "2-steps forward, 1-step back" when more than a couple of students seems distracted. This technique is merely calling on specific students (names drawn at random on popcicle sticks) and asking them to review segments from the past, 5, 10, or 15 minute period. Now, when students hear me "shaking the can", they know there's a brief Q&A… >>>