You put it on the back of your bike and go on a ride with your child. I'm considering buying this. Let me know your thoughts. This one fits my daughter. Thanks, Beth http://www.bikemania.biz/bicycles/mission-piggyback-mk2-folding-childrens-special-needs-bike-trailer/ -- Beth Hunsberger 901-438-3454 cell ----------------------- To change your mail settings or leave the C-PALSY list, go here: http://listserv.icors.org/SCRIPTS/WA-ICORS.EXE?SUBED1=c-palsy