Indoor Tennis in Toronto

So my latest obsession, (other than making pizza over and over again) has to do with finding some hobby that makes me active.  I'm not talking walking to the corner grocery store to buy food as active, but something that makes me sweat from running, chasing balls or people.  I have a passion for tennis and golf.  However, I live in the land of winter for 9 months, and construction for 3.  So, I have been looking for an indoor tennis club for this winter and have found a bunch but need to call.  That's the part I dread.  "Sorry ma'am, registration is closed."  "Sorry ma'am, club is not open for winter."  Or how about "Ma'am, to join our club, you have to sell the soul of your first born child and buy a fur coat from Holt's to prove you're worthy."  I'll let you know if I find something...and that's one big IF.