Reviving this thread, as I'll be joining an indoor tennis centre in Glasgow tomorrow, so will hopefully be playing lots of tennis over the winter months for once.
Played there the other day, and wow, it's absolutely incredible the difference playing indoors makes.
Had to shorten my swing a tad as the ball travels so much quicker. My serve also seemed unbreakable at times, when in reality it's an average serve.
Any one else play indoors regularly?