It's not your typical 6th grade class. Desks have been replaced by exercise bikes.
"At first I thought it was a joke. I didn't think it was really serious but then after I heard it was real and stuff I was excited to go and try it out," says 6th grader Katie Lundy.
It started as a dream of Sandy Slonaker, a health teacher at Sinking Springs Elementary in the Central York School District.
"The CDC as of 2010 it was 20% obesity in every state in the U.S., seeing that and constantly being bombarded with obesity and seeing kids out of breath and just seeing this take place it's like, what can I do? How can I make a difference?" Slonaker says.
She began writing grants to cover the cost of 27 stationary bikes. The biggest challenge for students: writing while biking.
"You get used to it after awhile, but when you do it for the first time it's like you're back in kindergarten writing with a big pencil, but it's a lot of fun," Lundy says.
Each bike has a cup for pens and a clipboard for writing. Lessons continue as usual, all while pedaling.
"I like this better instead of sitting at a desk where you can't do anything and this you can bike while you're sitting and listening and talking," says 6th grader Darius Kunentzler.
Slonaker sees the bikes boosting self esteem and, she hopes, teaching her students healthy habits at an early age.
"You can't say that having kids biking on bikes isn't helping them somehow, no matter how slow or how fast they're going there's no way it can't help them," says Slonaker.