There are a vast range of stretches and exercies that one can perform off-the-field regularly and on-the-field prior to combat to help specifically develop your capabilities in regards to combat and to best prepare you to fight.  Any and all cardiovascular ("cardio") exercise will help develop your stamina (by which a surprising number of fights are won) and improve your ability to breathe on the field.  Stretches and exercises that enhance the wrist flexors, elbow tendons and ligaments, triceps and biceps, shoulders, and chest will help improve your swordwork capabilities by improving the range and power of your Virtuous Wrist and Virtuous Extension.  Stretches and exercises that enhance the hip flexors, Illiotibial bands, quadruceps, adductors, piriformis (hip rotator), gluteus and hamstrings help improve the range and power of blows by enhancing Virtuous Rotation.  Stretches and Exercises that help enhance the calves (Gastrocnemius) and the Achilles Tendon also help significantly improve the range and power of blows by enhancing Virtuous Turn.  Finally, core and balance exercises help with Virtuous Stance and maneuver and with blow development and recovery throughout.  Good resources to have with you include The Stretch Deck (Olivia H. Miller, Chronicle Books) and The Strength and Toning Deck (Shirley Archer, Chronicle Books) which provides some of the material provided below and whose cards can be kept with you in your gear.

Exercise Equipment

Wrist and Hand Equipment

There a number of tools for improving grip strength and wrist flexor strength which will improve the power of Virtuous Wrist and Virtuous Extension.  These include the Gripmaster series of Hand Exercisers which allow one to train each finger with Extra Light 3-Pound, Light 5-Pound, Medium 7-Pound, Heavy 9-Pound versions.  Dyna-Flex offers their Powerball gyro exercisers that are offered in 25lb, 30lb, 35lb, and 40lb versions and for which you can buy a Docking Station to get the balls started.  They are used in hand, wrist, forearm, and elbow strength conditioning.  Many exercises can be done using small weight dumbbells with varying weights for different exercies.  Individual dumbbells or various types of dumbbell sets (one example) prove helpful for such exercises.

Elbow and Arm Equipment

If you are experiencing elbow problems, significant relief can be gained by bands which change the lever point and reduce the pressure on the elbow joint such as the widely popular Aircast and the things like the Gel Band Arm Band (same idea, but the gel can be iced to reduce inflammation).  Ice is strongly advised for lowering inflammation for problem areas, and easy-to-use and easy-to-wear velcro gel wrap products like the Cold One Elbow Ice Wrap are great aids in this regard.  Many people are now familiar with Tiger Balm -- a menthol-based oriental analgesic that help relieve pain and loosen muscles that is now widely available at commercial drugstores, but there are much more powerful versions of oriental analgesics available, such as White Flower Oil (beware... this is Tiger Balm on Nuclear Steroids).

Core and Balance Equipoment

There are a number of tools for improving core strength and balance.  There are balance ball chairs (alternative version) in which one can sit at one's desk improving core strength as one works.  There are balance trainers including the Bosu Balance Trainer or a wide-range of different type of wobble boards (remember the wider, the easier) -- many of which come with instructional DVDs to help guide you through the exercises.  For further guidance (and perhaps more fun), the Nintendo Wii Fit has a range of balance game/exercises that can help develop your balance and core strength.

Stretches

Wrist Stretches

Elbow Stretches

Shoulder/Arm/Chest Stretches

Hip Stretches

Leg Stretches

Exercises

Wrist Exercises

Elbow Exercises

Shoulder/Arm/Chest Exercises

Hip Exercises

Leg Exercises

Core/Balance Exercises