On some subsequent lesson, it is well to select an upwind track along a very S shaped course. By flying upwind the relative ground speed can be reduced with no reduction in airspeed. This permits relatively steep turns. Any gain in altitude during a steep turn has a dramatic effect on airspeed and can precipitate an accelerated stall. I advocate applying full power during these turns and strict supervision to prevent altitude gain. On completion of the turn the power is again reduced to cruise. I often give the student an emergency which results in an off-airport landing. I have found this particular flight a good student confidence builder.