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Debunking Myths: Why Squatting Deep is Healthy for Your Knees

Writer: Jonny Slick
Jonny Slick
Feb 14, 2024
3 min read

Updated: 4 days ago

Deep squats are not automatically bad for your knees. For many people, gradually training through a comfortable range of motion can improve strength, mobility, and confidence. The appropriate depth depends on your anatomy, training history, current symptoms, technique, and the load being used.

A deep knee bend and a loaded squat are related movements, but they are not always performed or progressed the same way. The important question is not whether everyone should squat as low as possible; it is whether the depth and load are appropriate for the individual.

This article explains how squat depth affects the knees, why stopping at exactly 90 degrees is not a universal safety rule, and when modifying depth makes sense.

personal trainer squatting deep

Deep Knee Bends vs. Squats

Stopping every squat at exactly 90 degrees is not a universal knee-safety rule. Joint forces change throughout the movement, and the most appropriate range depends on the person, the exercise, and the load.


How Squat Depth Changes the Movement

A deeper squat uses more hip, knee, and ankle motion. When that range is comfortable and the load is progressed gradually, it can be a useful way to build strength through a larger range of motion.


Research comparing squat depths shows that depth changes muscle demands and joint loading. That does not make one depth automatically best for everyone; it means depth should match the training goal and the lifter’s current capacity.

deep barbell back squat

Are Deep Squats Bad for Your Knees?

Deep squats can be appropriate for healthy knees when technique and loading are suitable. Pain, swelling, a recent injury, or a range you cannot control are reasons to modify the movement and seek individualized guidance.


Knee stress is not determined by depth alone. Load, speed, technique, anatomy, training history, and fatigue all matter, which is why blanket rules about a single safe stopping point are misleading.


Training through a greater comfortable range can support strength and athletic development, while partial squats can also be useful for specific goals. Both can belong in a well-designed program.

female lifter squatting low
male athlete squatting below 90 degrees

When to Modify Squat Depth

If you have a current or previous knee issue, begin with a range you can control without worsening symptoms. Gradually add depth or load as your tolerance improves; there is no prize for forcing a position your body is not ready to own.



The bottom line: use the deepest range you can perform comfortably and control under an appropriate load. Squat depth is a training variable, not a test of toughness.


Stay strong,

Jonny


Need Help Putting This Into Practice?

If you want a plan built around your goals, experience, and limitations, learn more about personal training in Frederick or start with a free Strong Start Session.

References:


  1. Caterisano, A., Moss, R. E., Pellinger, T. K., Woodruff, K., Lewis, V. C., Booth, W., & Khadra, T. (2002). The effect of back squat depth on the EMG activity of 4 superficial hip and thigh muscles. Journal of Strength and Conditioning Research, 16(3), 428-432.


  1. Escamilla, R. F., Fleisig, G. S., Zheng, N., Lander, J. E., Barrentine, S. W., & Andrews, J. R. (2001). Biomechanics of the knee during closed kinetic chain and open kinetic chain exercises. Medicine and Science in Sports and Exercise, 33(2), 351-360.


  1. Hartmann, H., Wirth, K., Klusemann, M., Dalic, J., Matuschek, C., & Schmidtbleicher, D. (2012). Influence of squatting depth on jumping performance. Journal of Sports Sciences, 30(9), 1-7.


  1. Kritz, M., Cronin, J., & Hume, P. (2009). The bodyweight squat: A movement screen for the squat pattern. Strength & Conditioning Journal, 31(1), 76-85.


  1. McKean, M. R., Dunn, P. K., & Burkett, B. J. (2010). The lumbar and sacrum movement pattern during the back squat exercise. Journal of Strength and Conditioning Research, 24(10), 2731-2741.


  1. Simenz, C. J., Dugan, C. A., & Ebben, W. P. (2005). Strength and conditioning practices of National Football League strength and conditioning coaches. Journal of Strength and Conditioning Research, 19(3), 486-492.

 
 
 

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