Tennis Tools for Winter Training (updated)
Balance Trainer: Dynamic BalanceHow to Develop Better Balance
I just got this and love this little blue balance trainer! It's basically like an under-inflated cushion that you try to keep your balance on for as long as possible. The wobbling nature of the tool forces you to keep your core balance stable in order to stand. You actually use a lot of muscles to counter-act the forces that are tipping you over.Creative exercises for tennis
It's actually kind of fun to see how long you can keep your body balanced and centered. After 5-10 mins with the rubber band drill, your legs will be burning. When it's cold outside or you're limited in space, you have to be creative to stay "fit to hit"! Another drill to try is to side-step on a treadmill while simulating a swing motion with your arms (both forehand and backhand). Here are a few other tennis exercises you can do at home.
Agility Ladder: Foot Speed and Quickness
Drills:
Check out some of these great tennis-specific drills on YouTube anyone can do.
SKLZ Ladder:
I highly recommend getting an Agility Ladder that will not snag easily and sturdy enough to last, plus this one even comes with a DVD and carrying bag.
PracticeHit: Master your swing indoors
Easy to use, long term pay-off
Best of all it doesn't take much space and helps you with your balance and coordination tremendously. In home or gym, all you need is a little corner to put it and just do a few mins a day with it.
You can also build core strength and stability with all these cool workouts you can do with it.
Bosu Ball - Jumping and Split-step exercises
Also featured at www.atpworldtour.com - here are some Tips for the Bosu ball too
As a professional tennis instructor, I can feel how much better my balance is now on one foot or when I get stretched out wide.
The Bosu Ball tool does a great job of isolating muscle groups and keeping you "light on your toes". These exercises can be combined with small dumbbells to add to the intensity of squats, etc.
Buy 1, Get 2nd 
