This looks like a lot of fun- it’s the ChalkTrail Bike Attachment. As the name implies, simply attach it to your bicycle (no tools needed!) and leave a trail of chalk. It’s like a low-cost light cycle! It comes in either blue or red. Each piece of chalk is good for 1.5 miles.
Make a line, draw crazy shapes, play follow the leader, try to write words- the possibilities for kids to have fun with this are endless. Plus parents can put it on their kid’s bikes to track down where they pedaled off to (ok, maybe not really). Fun stuff and allows for some artistic creativity while exercising. Win win.