NFP.com Matt Bowen shares three running plays that are the most difficult to defend in the NFL. The Power O, the Stretch, and the Crack Toss.

When you think Power O think about Atlanta Falcon Michael Turner, Oakland Raider Darren McFadden, and new Chicago Bear Michael Bush.

Big running-backs that are all but certain to have goal line carries.

However big men are not the only ones to run the Power O. Smaller backs with speed can be just as effective when the lead back is executing the blocking scheme.

The Stretch is something that we may see heavily used here in Chicago as Bears offensive coordinator Mike Tice has hinted to inserting some more zone schemes that involve the running scheme. So keep a close eye on Matt Forte in the preseason to if this play is executed by the Chicago Bears. 

Other teams that will feature this running scheme are Houston Texans Arian Foster and the Kansas City Chiefs Jamaal Charles.

The Crack Toss is the one that has me a little stumped because this is used much more effectively in passing plays then a pitch out.

Think about WR/RB when thinking crack toss because this is a scheme that is very effective underneath the defense or in the flat.

When I think crack toss I think New Orleans RB Darren Sproles, Miami RB Reggie Bush, and even Chicago Bears WR Devin Hester. 

Quick change of pace backs with great hands that can get into space.

Overall great stuff by Bowen because it has me thinking about scheme rather than stats.

It will be exciting to see teams that can execute these plays as the base play of the running game and which players will be automatic when it comes to fantasy points.