Roll the dice: Roll a pair of dice and practice while playing games, coloring, etc.
Bankruptcy Game: Put a bunch of plastic/real coins in a bag but color one of them red. After each repetition, you and your child will both pull out one coin. If anyone pulls out the red coin, they have to put all of their coins back (bankrupt!). Whoever has the most coins after 5 minutes wins.
Hold Yoga Poses: Look for pictures of yoga poses for kids online. Have your child choose one and hold it while he does his skill. See how many repetitions s/he can get in before he loses the pose.
Trace Lines or Shapes: Draw lines or shapes on a piece of paper. Then, laminate that page or put it in a plastic sheet protector. Have your child trace the lines or shapes with a dry erase marker while repeating his skill. When he's done, erase and use again next time.
Put Blocks on a Tower: Each time your child practices the skill, give him a block to place atop a tower. When the tower falls, take the blocks back and start over. See how tall he can make it before it falls.
Play Hopscotch: Draw a hopscotch track (or other shapes/numbers) on the ground and have your child do the skill once before each jump or move on the track.
Moving Beans or Marbles: Place beans or marbles in a small container. Get a second similar container. For each repetition, move one bean or marble to the other container. When all the beans/marbles are moved, you're done!
Make Me Jump: Each time your child does the skill, have someone else (you or another adult/child) jump or do another action. See how many times your child can make that person jump during 5 minutes.
Playdough: Give your child a pinch of playdough (or a similar substance) for every repetition. Once your child has all of the playdough, he can play with it.
Go for a Walk: When you are walking somewhere with your child, have him take one step for every repetition. Try this one when you're walking to the playground from the car or into the house when you get home.
Stoplight Speech: While you're sitting at a red stoplight, see how many times your child can do the skill correctly before the light turns green.
Playing Cards: Get a playing card for every repetition. When your child has all of the playing cards, you can play the game with him.
Blowing Bubbles: Blow bubbles for every 10 repetitions that your child does.