A combination of 25kt winds, 8kt thermals to 4000' and beefy showers made for some sporty flying. Paul Lazenby and Paul Gentil demonstrated that's possible to do spins in the K13 and not lose height while the CFI showed us that is equally possible to thermal in a Ventus and not gain height. I learned that it's advisable to keep your air vent closed when flying through hail showers. All the gliders got very well washed in the showers, as did the pilots.