Just curious if anyone does anything inside their home to improve their tennis and that wouldn't be a waste of time. I live in the NE so outdoor tennis season is coming to an end and I only play once or maybe twice a week during the winter. I live in a condo so don't have access to a garage or anything like that. Would volleying into the air trying to use as close to actual volley form as possible help at all and gain me a better feel on volley? Or simulating my service motion and groundstrokes? I'm thinking of maybe just doing a short amount of time each day but thinking if I do it every day over the winter it would add up over time. Anyone have any thoughts or am I nuts?