Here's some more Isolation Training examples from Robert Chu. These are used to help the beginner develop good structure, learn to control their balance and use their structure to generate power, and how to disrupt the opponent's structure and balance:
1. Medicine ball drill: two students stand in YJKYM facing each other and toss a 15 lb medicine ball back and forth using their structure to send (throw) and receive (catch) force (the ball) for a set of 30 reps each. Variations of stances and steps can also be done. The students have to keep their elbows in and aligned with the hips to use their structure to sink and absorb force as they catch the ball, and then expand and rise as they throw or send the ball.
2. Jut/Tok drill: This is the practice of the linking or intermediary movement from the dummy form. Stand in front of the dummy and apply Jut Sao to both arms, jerking the dummy forward and down as you sink your structure, then apply Tok Sao to both arms shoving the dummy back and up as you rise and expand your structure. Do this for 30 reps every day being sure to use the stance and structure and not just the arms.
3. Ngaat Yiu exercise: This one actually comes from Pan Nam Wing Chun via Eddie Chong. Two students stand in YJKYM facing each other while grasping each other at the elbow. Then they alternately try to off-balance each other by pushing or pulling in any direction. The first partner to step out of his stance is the loser! This is a fun exercise and is used as the preliminary training for Chi Gerk as well as application of throws, sweeps, kicks, and knees.
Again, the intent is to isolate, work on and develop attributes that would be much harder to develop by doing forms and Chi Sao alone.