With a sturdy frame and a slip resistant surface, the Mutsy 4 Rider Step Up Board is the best accessory you can choose for your new stroller if your baby has an older sibling whose little legs get tired of walking. The single swiveling wheel doesn't hinder your Mutsy's maneuverability at all, and it clips easily on and off the 4 Rider and Urban Rider strollers. Save your tired back the stress from carrying your older child when his energy runs out before you've reached your destination.