What is one of the key checkpoints for performing the Rear Lunge correctly?

Maintaining a straight back during the Rear Lunge is crucial for several reasons. First, it helps to ensure proper body alignment and posture, reducing the risk of injury while performing the exercise. A straight back allows for better utilization of core muscles, which stabilizes the spine and supports the movement. This alignment also ensures that the force is distributed properly through the lower body, enhancing overall effectiveness and safety during the lunge.

In contrast, keeping the rear leg locked can lead to improper mechanics and potential strain on the knee joint. Knees touching the ground is not necessary for efficacy of the exercise and can also promote poor form, potentially leading to injury. Feet crossing over each other can create an unstable base and also skew alignment, which is contrary to the purpose of performing the lunge effectively. Thus, maintaining a straight back is fundamental to executing the Rear Lunge correctly.