Well.... this is nasty!
Researchers recently took samples at three different gyms to see how gross the equipment was. It turned out almost everything was pretty disgusting, and 70% of the bacteria they found was the kind that can make you sick.
Three things that were covered in the most bacteria were free weights like dumbbells, the handlebars on exercise bikes, and the handlebars on treadmills.
Check out the full list HERE.