Quoting TheyCallMeMOMMY♥:" http://www.walmart.com/ip/InStep-Safari-Double-Jogging-Stroller-Gray-and-Green/15689707 Im getting that ... [snip!] ... and the sit n stand seat has to be fully reclined to have the carrier in it, so less room for the child to sit on the bench."
My son was once like that...with the whole running thing. (he was 2.5 years old when I had my newborn). All I would do, when he didn't want to sit or stand on the stroller was get hi to hold the side of the stroller, and if he started running away, I would buckle him in and explain to him that if he is going to run away then he cant walk, he has to get buckled in. That did the trick.
and to this day I can trust that he wont pull that B.S.