Workout gear that you can wear in hot (or maybe even cold weather)
Tennis balls to play with
A court
Optional things for playing
Some sort of hat
A doubles partner
A friend to play with
1. Holding an eastern forehand grip (the palm is placed against the same bevel as the string face), you should be able to fit the index finger of your non-hitting hand in the space between your ring finger and palm. If there isn't enough room for your index finger, the grip is too small. If there is space between your finger and palm, the grip is too big.
2. If you don't have a racquet handy, you can also measure your grip size using a ruler. With your hand open and fingers extended close together, align the ruler with the bottom lateral crease of your palm and measure to the tip of your ring finger.
To find more information on grip size you can visit this site Tennis Warehouse