Cheng Man Ching 37 Posture Short Form

There are many different Tai Chi styles and the number of postures in their forms vary greatly. The original Tai Chi form consisted of 13 postures, based on the 8 trigrams and 5 elements.
One of the most widely practiced styles of Tai Chi, Yang Style Long Form, uses a form with 108 postures and generally takes at least 20 minutes to complete.
Professor Cheng Man-Ching studied the Yang Style Long Form with the famous Tai Chi Master Yang Cheng-Fu, of the Yang Family lineage. Professor Cheng was one of Yang Cheng-Fu's most accomplished students, and was given special permission to shorten the form so that he could teach it more rapidly to the Chinese military during World War II.
This new shortened 37-posture form eliminated many of the repetitious movements that existed in the long form, while maintaining essence of the Long Form. Professor Cheng taught it for the rest of his life, ultimately transforming it into a form designed primarily for the cultivation of energy (ch'i) and health, differing from its mother form which was designed primarily for martial purposes.
Called the Yang Style Short Form during his lifetime, today the form created by Professor Cheng is called the Cheng Man-Ching form, because although his final version of the form roughly follows the Yang Style Long Form, the essence of it is quite different.
In spite of the changes Professor Cheng made, his form does not betray its martial roots. Concealed within the postures are the original martial applications. Combining highly-developed softness, sensitivity, and energy as cultivated by Professor's form with the hidden martial applications is what makes this form particularly powerful.
Professor Cheng stated that one should take at least 7 minutes to perform his form for health benefits, and 10-12 minutes for "something more".
The 37 postures of Professor Cheng Man-Ching's form are as follows:

Preparation wu chi
Beginning
Left Ward-Off
Right Ward-Off
Roll Back, Press, and Push
Turn the Body and Lower the Hands
Single Whip
Lift Hands
Shoulder Strike
White Crane Spreads Its Wings
Brush Knee, Twist Step
Strum the Lute
Brush Knee, Twist Step
Step Forward, Move, Parry, and Punch
Apparent Close-Up
Cross Hands
Embrace Tiger, Return to Mountain
Ward-Off, Roll Back, Press, and Push
Turn the Body and Lower the Hands
Diagonal Single Whip
Fist Under Elbow
Step Back to Repulse the Monkey
Diagonal Flying
Cloud Hands
Descending Single Whip
Golden Rooster Stands on One Leg
Right Toe Kick
Left Toe Kick
Turn Body, Heel Kick
Brush Knee, Twist Step
Step Forward and Plant a Punch
Step Forward to Right Ward-Off
Roll Back, Press, and Push
Turn the Body and Lower the Hands
Single Whip
Fair Lady Works Shuttles
Left Ward-Off
Right Ward-Off, Roll Back, Press, and Push
Turn the Body and Lower the Hands
Descending Single Whip
Step Up to Seven Stars
Step Back to Ride the Tiger
Turn Body, Lotus Kick
Draw a Bow to Shoot the Tiger
Step Forward, Move, Parry, and Punch
Apparent Close-Up
Cross Hands
Close T'ai Chi