Squats Vs. Single-Leg Training | Jeff Cavaliere, Mike Boyle & Gabrielle Lyon, D.O.

Heavy bilateral lifts like squats can lead to injury and may be less effective for athletic performance compared to unilateral training, which aligns with the body's natural neurological movement patterns.

• Heavy bilateral lifting, especially back squats, is frequently associated with injuries.

• Unilateral (single-leg) training provides equal or greater strength benefits due to the 'bilateral deficit.'

• The body is neurologically designed for unilateral movements, making single-leg training more functional and effective for athleticism.

Traditional heavy bilateral exercises, particularly back squats, are linked to a high incidence of injuries among athletes and medical professionals alike, leading many to seek safer and more effective alternatives. Unilateral (single-leg) training emerges as a superior method for developing strength and athleticism, demonstrating that individuals can achieve equal or greater strength on one leg compared to two due to the 'bilateral deficit' phenomenon. This approach is advocated as being more aligned with how the human body naturally moves and performs in athletic contexts.

Critique of Bilateral Training

• 00:00:39 Early experiences with powerlifting, involving heavy bench presses, squats, and deadlifts, frequently led to injuries, including back problems, prompting a reevaluation of these traditional bilateral movements. Many strength coaches observed that back squats were a primary cause of back issues in athletes across various levels, raising questions about their continued use despite mandated adoption by football coaches.

Emergence of Unilateral Training

• 00:01:04 Necessity drove the discovery of single-leg training as a viable alternative for achieving optimal lower body hypertrophy and strength without the risks associated with heavy barbell squats. This shift in perspective challenged the long-held dogma that traditional bilateral squats were the 'king of all lifts' and the sole path to significant lower body development.

The Bilateral Deficit Phenomenon

• 00:03:13 Research on the 'bilateral deficit' reveals that individuals can often produce more total force or strength when using one limb at a time than when using both simultaneously. This phenomenon was strikingly observed in testing, where athletes could split squat the same weight they could front squat, indicating that one leg could generate force comparable to two, challenging conventional strength training beliefs.

Neurological Basis for Unilateral Movement

• 00:05:27 The body is neurologically wired for unilateral movement, evident in common athletic actions like jumping off one foot to dunk a basketball or throwing a baseball with one arm. Ignoring this natural predisposition in strength training, particularly through an overemphasis on bilateral exercises, can potentially limit athletic performance and even make athletes 'less athletic' by dampening the nervous system.

Modern Training Paradigms

• 00:07:20 Observing elite athletes in track and field and Olympic lifting, who exhibit high levels of athleticism, reveals a greater emphasis on unilateral and dynamic movements compared to the static, lumbering nature often seen in heavy powerlifters. While teaching proper bilateral squat mechanics to young athletes can mitigate some risks, the overall consensus leans towards single-leg training for its functional benefits, reduced injury risk, and alignment with the body's preferred movement patterns, especially for the aging population.