Coach Note: When to increase intensity of stretching? Stretching intensity can increase by adding load, making stretches dynamic, or adding various contractions on all sides of the joint - but when is it appropriate to use these stretching variations?
Similar to progressing in the gym, it is highly individual and requires a gradual increase in intensity. You would not squat 200lbs the first week of a program and then jump to 500lbs in the second week of the program. The adaptation to lifting more weight requires a SLOW progressive overload.
The same concept applies to stretching. Slowly increasing the intensity of stretching. Do not rush the process if you would like to achieve long term and sustainable progress.