The next drill we will practice is paddling the boat in a straight line.  Instructors will be separated roughly 50 yards apart and safety boaters will be interspersed along the way.  Groups of paddlers will paddle in a straight line in each direction.  We will be watching for good torso rotation, good paddle blade entry point, and recovery at your waist.  A good strong forward stroke is challenging to master but critical in whitewater.  We will also be watching closely to ensure no one has the dreaded "Death Grip".  We want clean forward strokes that use your torso.  Here is a nice article on forward stroke technique by a world champion: 14 Tips Forward Stroke (NOTE: This webpage takes a bit of time to load).