https://www.wired.co.uk/article/running-wheels-mice The researchers put a bit of food near the wheel in order to lure the animals to the right area. They found that many wild mice would find the wheel, climb on and start running. Other animals to enjoy the ride were frogs, rats and shrews: the frogs would hop from side to sort to make the wheel swing back and forth while slugs seemed to rock up to the party by accident. That's slugs for you. Over three years more than 200,000 animals used the wheels. Activity was monitored using a small magnet attached to the wheel and a stationary magnosensor. Mice were most keen on the wheels, running for more than 1 minute in 20 percent of cases, with one mice running for an astonishing 18 minutes. The mice never walked. The researchers were concerned that the food placed need the wheels may have induced the animals to run, so they stopped providing food near one of the wheels for more than a year and the running continued. The number of visits to the wheel did drop significantly, but the amount of wheel running activity among those animals that did visit increased by 42 percent.
Between the lines : ,,Even the little animals know that it's a bad deal to exercise after eating. Not like me and my 16.y.o friend , 16 years ago, both ate 2 pounds of pasta with beef, and rushed into gym, until the food was still inside the stomach, to maximize the protein absorbtion.