Leg Strength and Range of Motion: Choose a Repeatable Working Range

Start with the movement, not the slogan

Range of motion is not a moral score. A deeper squat, longer lunge, or larger calf-raise excursion changes joint positions and often changes the load you can manage. The useful question is whether the chosen range is repeatable and matches the purpose of the exercise, not whether it resembles someone else’s photograph.

Compare the setup before you compare the exercise name

Support and setup can change usable range. Holding a rack during a split squat may let a person descend more consistently because balance no longer dominates. Raising the heels in a squat changes the setup. A box squat sets a target depth. These are exercise choices, not proof that a body needs correcting.

A practical observation

Use a range record for one movement: note the visual endpoint, the load, and the number of repetitions that reached it. For a step-up, the endpoint might be “full stand with level pelvis.” For a squat, it might be “same depth as the first rep without losing position.” Compare only sessions with the same endpoint; otherwise the numbers mean different things.

Build the session around the actual task

A partial range can be deliberate when it is the task you can control or when a specific position is being practiced. A larger range can be useful when it remains manageable. ACSM's guidance places progression in context of individual capacity, training status, and goals, so it does not require one depth for every person or exercise.

Give the endpoint a name

“As low as possible” is a poor log entry. Better endpoints are visible and repeatable: thighs touch a box, rear knee reaches a folded pad, heel lowers to a platform level, or hips remain level at the top of a step-up. The endpoint need not be maximal to be useful. It must be clear enough that a later set can be judged by the same standard.

Illustrative example: Choose a goblet squat to a box. Perform three sets of eight with a load that allows a brief controlled touch rather than a collapse onto the box. Record the box height, dumbbell, shoes, and whether all eight repetitions touched under control. At a later session, either add load at the same box height or use a lower box with the same load. Changing both produces a new exercise version.

ACSM frames resistance progression around goals, capacity, and training status rather than one compulsory depth. ACSM position stand A gym range is a training variable, not a medical conclusion or a promise about sport transfer.

Support can be part of the range decision. A hand on a rack during a split squat may allow the moving knee and hip to travel through a steadier path because balance no longer interrupts the repetition. Record the hand support instead of pretending the two versions are identical. Likewise, a heel wedge, different shoes, or a different platform changes the exercise setup. These are not cheating or errors; they are variables that make the range worth describing precisely.