I made the following videos to help with the Exercise Technique Quizzes in PT101, Fitness Assessment and Exercise Prescription PT Lab I.

Exercise Technique Quiz 1 Video Help: Crunch
Crunch

Exercise Technique Quiz 2 Video Help:Stability Ball Crunch
Stability Ball Crunch

Exercise Technique Quiz 3 Video Help: Leg Curl
Leg Curl

Exercise Technique Quiz 4 Video Help: Leg Press
Leg Press