Now I'm going to analyze the main moving parts and action essentials of a wave of traditional hard pull and straight leg hard pull.
First, the traditional hard pull.
The traditional hard-pulling method is to lift the barbell from the ground, which has a large movement range. The main exercise is biceps femoris (hamstring), but it also involves hip muscles and lower back erector spinae. The difficulty of traditional hard pull is relatively high for beginners, except that the action range is large and involves many muscles, which is easy to be confused with squat action.
Traditional hard graph
Second, straight legs are difficult to pull.
Straight leg hard pull, also known as Romanian hard pull, has a relatively fine movement range, and the barbell only drops to the level around the knee. In fact, the straight leg hard pull does not mean that the leg stands straight in different places, but that the knee of the leg is not so moving, so it is more targeted at the biceps femoris (hamstring muscle) than the traditional hard pull.