You mean something like this?
Also known as a High-Striker or Strong Man. I just whipped that up, which is why the Hercules sign sucks.
All you would need to do is create an animation of it going up to (for this example I'm using the above) Just Wimp, 100, More Protein, 200, Average Joe, 300, Strong Man, 400, Red Zone, Hercules. You could have a meter that goes back and forth and depending on what zone it lands on after you click or press a button it will go to said height. Depending on the height you win certain prizes and collect points and if you hit the Hercules you have an animation of the bell ringing back and forth.
You could create 4-5 different animations (or we would) of a guy leaning back and hitting at different heights and then implement them into the game. Once s/he hit the red circle a red meter rises up to the levels and depending on the level it produces a different sound.
For background images you could have a ferris wheel, roller coaster, circus tents, etc. For more machines I suggest looking up Carnival Machines on Google. I've already found some good links. Cotton Candy machines and popcorn machines could also be placed as background scenery.
And as you can see that strong man I created sucks because there are little white spots at the bottom and the Hercules sign is terrible.
Hope this helped. ( I had a similar idea a while ago but never really went with it )