"Concentration drills"?

"Goal Line Sit Ups" -- pair everyone up across from their partner and seated hip to hip with the pair next to them. Legs are bent and each player holds partner under their knees with their forearms and hands. You'll end up with a long row of pairs...you can split them up by class if you want...one side begins on their back while the other side is holding while seated upright...Coach blows whistle...each time whistle is blown, side that began down does 1/2 sit up (from down to up or up to down)..must be done together and fast everytime whistle is blown. Blow the whistle anywhere from 5 - 10 times...if NO mess ups, blow one long whistle, other side prepares to go...you have now moved from the 5 yd line to the 4 yd line...If one guy messes up, they start back at the 5. If you get all the way to the endzone, celebrate big time! Great concentration drill to do at the end of the period. pdow