Hip Thrust vs. Squat: The EMG Research That Changed How Trainers Programme for Glutes

Before 2010, the barbell squat was the default primary exercise for glute development in nearly every evidence-based training programme. The hip thrust was a niche exercise used by powerlifters for lockout strength.

EMG research changed this picture — and the shift in programming practice that followed represents one of the clearest examples of data driving meaningful change in how personal trainers work.

The Landmark Research

The most influential work in this space came from Bret Contreras and colleagues (2015, published in the Journal of Applied Biomechanics), which directly compared barbell back squat and barbell hip thrust EMG during matched-load conditions.

The headline finding: Barbell hip thrusts produced significantly higher gluteus maximus EMG activation than barbell back squats during both peak (concentric) and mean muscle activation measurements.

Hip thrust gluteus maximus: Mean activation approximately 229% MVC
Back squat gluteus maximus: Mean activation approximately 130% MVC

The difference is not marginal. The hip thrust produces approximately 75% more gluteus maximus activation than the squat at matched relative loads.

This finding has since been replicated multiple times across different populations and loading conditions.

Why the Hip Thrust Activates More Glute

The biomechanical explanation lies in the position of peak resistance relative to the glute's active range:

In the squat: Peak resistance (the bottom of the movement) occurs at maximum hip flexion — where the glute is elongated and not positioned for maximum force production. The lockout, where the glute would produce maximum force, occurs at the lightest point in the movement.

In the hip thrust: Peak resistance occurs at or near full hip extension — the position where the gluteus maximus is best positioned to generate force. The movement is loaded where the glute is strongest, which drives higher peak and mean EMG activation.

This is the same principle behind peak-contraction exercises in bodybuilding — loading a muscle in its maximally shortened or functional position tends to drive higher activation.

What the Research Shows for Glute Building Specifically

Beyond raw activation levels, a 12-week training study by Contreras et al. (2019) directly compared hip thrust and squat programming for glute hypertrophy and strength outcomes.

Findings:

Both groups improved glute strength
The hip thrust group showed greater improvements in hip thrust 1RM and gluteal thickness (measured by ultrasound)
The squat group showed greater improvements in squat 1RM
Both groups improved similarly on tests of athletic performance

The practical conclusion: If the training goal is specifically gluteal hypertrophy, the hip thrust should be the primary exercise, supplemented by the squat. If the goal is squat strength, the squat should be primary. For most personal training clients, whose goals include both glute development and general lower body strength, a combination of both is the evidence-based approach.

Squat Depth and Glute Activation

One nuance the hip thrust vs. squat debate often misses: squat depth significantly affects glute activation.

EMG studies comparing parallel and deep squats consistently show that:

Full depth (hamstrings to calves) produces substantially higher gluteus maximus activation than parallel
The increase is largest at the bottom of the movement and during the stretch-shortening phase
At full depth, the squat's glute deficit relative to the hip thrust narrows

For trainers programming squats for glute development, depth is non-negotiable from an EMG standpoint. A client squatting to 90 degrees is performing a quad exercise; a client squatting to full depth is performing a more balanced posterior chain exercise.

Individual Variation in Hip Thrust EMG

While the population-level advantage of the hip thrust is well-established, individual variation is significant — and this is where in-session EMG is most valuable.

Some clients show high glute activation in the squat due to:

Anatomy (hip socket depth and orientation affects glute recruitment in hip extension)
Long training history with squat-based movements
Limb proportions that produce a naturally hip-dominant squat

Conversely, some clients show lower-than-expected hip thrust glute activation due to:

Gluteal amnesia (the inhibition pattern discussed in the glute activation article)
Compensation from hamstrings during the hip thrust movement
Setup issues (bench height, foot position, bar placement)

EMG during both exercises tells you which category your client falls into — and whether your hip thrust setup is actually producing the activation the research predicts.

Common Hip Thrust Technique Errors Identified by EMG

EMG monitoring during hip thrusts regularly reveals technique issues that are not visible to the eye:

Hamstring dominance: When the posterior chain contribution is primarily from hamstrings rather than glutes, EMG shows elevated hamstring signal relative to glute. This typically occurs when the feet are positioned too far from the hips, reducing the glute's mechanical advantage at lockout.

Lower back extension compensation: When glutes fail to produce adequate hip extension, the lower erectors often assist via lumbar hyperextension at the top of the movement. EMG shows an erector spike at lockout — a pattern associated with lower back discomfort and reduced glute stimulus.

Asymmetric lockout: Bilateral asymmetry in hip thrust (one glute consistently outworking the other) is extremely common and not visible during the exercise without EMG. Left-right activation ratios below 85% during a bilateral hip thrust warrant targeted single-leg work.

Programming the Hip Thrust and Squat Together

Based on the EMG evidence and outcome research, the recommended approach for most personal training clients with glute development as a goal:

Primary compound: Barbell hip thrust or smith machine hip thrust as the primary lower body exercise (2-3 sets, 3-4x/week)

Secondary compound: Barbell back squat or Bulgarian split squat as secondary lower body work — targeting the quad, hamstring, and functional strength components that hip thrust alone doesn't maximally develop

Unilateral isolation: Single-leg hip thrust or single-leg RDL to address bilateral asymmetries identified by EMG

EMG monitoring priority: Hip thrust (most value — highest activation exercise, most common technique errors)

Frequently Asked Questions

Should all my clients be doing hip thrusts? Most clients whose goals include glute development, lower back health, or hip extension strength should have hip thrust in their programme. The exceptions are clients with current lumbar pain who cannot tolerate the hip thrust position (alternative: glute bridge or single-leg hip thrust with reduced load) and clients with mobility limitations that prevent adequate setup.

My client says they "feel it in their hamstrings" during hip thrust — is that a problem? It depends on magnitude. Some hamstring contribution to hip thrust is normal and expected. If hamstrings are clearly dominant on EMG — activation at or above glute activation — technique adjustment (foot position, bracing pattern) is warranted before adding load.

Can the hip thrust replace the squat entirely? For isolated glute development, yes. For overall lower body development, functional strength, and the quad stimulus that transfers to daily activities and athletics, a combination of both is more effective than either alone.

Inara brings real-time EMG to every session, letting trainers verify that the hip thrust is producing the glute activation the research predicts — for each individual client. See how it works →