Push it, Pull it & use the Punch Bar, coaches love this product. The PUNCH BAR Similates the Breast Plate of shoulder pads. Put your linemen in a 3 point stance have them fire off and ( using the punch bar ) lift the sled up off of the ground and push it down the field. A great way to get your linemen stronger with good technique! Again this is one solid unit, no asembly required!