Upper Legs Exercise · Smith Machine
Smith Bent Knee Good Morning
- Category
- Upper Legs
- Equipment
- Smith Machine
- Target
- Glutes
Biomechanical cues verified by the PlanWorkouts Science Review Board under CSCS editorial oversight; see our editorial standards.
The Smith Bent Knee Good Morning is a compound upper legs movement designed to train the Glutes with direct engagement of the Lower Back.
Posterior-chain dominant movement in the sagittal plane. High torque at the hip joint requiring forceful extension by glutes and hamstrings with static lumbar spine stabilization. Executing this with strict form maximizes muscle fiber recruitment while protecting joint structures.
Quick Exercise Facts
Target Muscle Activation
Bending the knees slightly on a good morning shifts some of the load off the hamstrings and onto the glutes compared to the stiff-leg version, while the Smith machine's fixed bar path takes some of the balance demand out of an already technical hip-hinge movement. It's still an exercise that punishes poor hip-hinge mechanics fast, so starting light and grooving the pattern is worth more than adding weight early. This one is about hip position, not knee bend.
How to Do the Smith Bent Knee Good Morning
- Begin standing with feet shoulder-width apart, toes facing forward.
- Rest the barbell across your upper back on your traps.
- Slightly bend your knees and hinge forward at the hips, keeping your back straight.
- Lower your torso until parallel to the floor, feeling your hamstrings stretch.
- Engage your glutes and hamstrings to lift your torso back to start.
- Complete your planned set count, emphasizing full range of motion and strong peak contraction in the glutes.
Recommended Sets & Reps by Training Goal
70–80% 1RM · 90–120s rest
85%+ 1RM · 2–3 min rest (Calc 1RM)
50–60% 1RM · 45–60s rest
Biomechanical & Joint Load Cues
Posterior-chain dominant movement in the sagittal plane. High torque at the hip joint requiring forceful extension by glutes and hamstrings with static lumbar spine stabilization.
Common Mechanical Mistakes & Form Errors to Avoid
- Lumbar Flexion (Rounding Lower Back): Rounding the lower back under heavy load shifts compressive forces into dangerous anterior shear on the intervertebral discs.
- Bar Drifting Forward: Allowing the weight to drift away from the shins creates a longer external moment arm, drastically increasing torque on the spinal erectors.
- Hyperextending at Lockout: Leaning back excessively at the top of the movement pinches lumbar facet joints rather than engaging the gluteal muscles.
Proper Breathing Patterns & Core Engagement
Inhale into diaphragm and brace core prior to pulling/hinging. Maintain rigid spinal alignment; exhale once hips lock out at standing height.
Add the Smith Bent Knee Good Morning to Your Custom Workout Routine
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Injury Modification & Joint Safety
If managing acute lumbar disc irritation or facet joint pain, prioritize neutral-spine trap bar deadlifts or single-leg Romanian deadlifts to minimize axial shear. If joint irritation persists, immediately stop and substitute this movement with another exercise from the Upper Legs exercises category.
Muscles Worked
The Smith Bent Knee Good Morning primarily targets the Glutes, with Hamstrings as the primary synergist muscle group, along with the Lower Back.
More Upper Legs Exercises
All Fours Squad Stretch
Arms Apart Circular Toe Touch (male)
Assisted Lying Glutes Stretch
Assisted Lying Gluteus And Piriformis Stretch
Assisted Prone Hamstring
Assisted Prone Lying Quads Stretch
More Glutes Exercises
Band Bent-Over Hip Extension
Band Hip Lift
Band Lying Hip Internal Rotation
Band Pull Through
Band Seated Hip Internal Rotation
Band Squat
Equipment Alternatives
Don't have smith machine? These target the same glutes with different equipment.
FAQ
- What muscles does the Smith Bent Knee Good Morning work?
- The Smith Bent Knee Good Morning primarily targets the glutes as the primary agonist. Synergist assistance is provided by the hamstrings along with the lower back. Maintaining strict biomechanical alignment ensures maximal tension remains focused on the intended muscle fibers rather than shifting to surrounding stabilizer joints.
- What equipment do I need for the Smith Bent Knee Good Morning?
- The Smith Bent Knee Good Morning is performed using a smith machine. Ensure all equipment is securely positioned with collars or safety pins locked before loading working sets. If you train in a home gym or minimal setup, explore our equipment-free and resistance band alternatives below.
- What is the most common form mistake on the Smith Bent Knee Good Morning?
- The most frequent error is lumbar flexion (rounding lower back): Rounding the lower back under heavy load shifts compressive forces into dangerous anterior shear on the intervertebral discs.. Controlling the 2 to 3-second eccentric lowering phase ensures maximal hypertrophic stimulus while shielding connective tissue.
- How many sets and reps should I perform on the Smith Bent Knee Good Morning?
- For muscle hypertrophy and size, aim for 3 to 4 working sets of 8 to 12 repetitions at 70% to 80% of your 1RM with 90 to 120 seconds rest. For absolute strength development, prioritize 4 to 5 sets of 3 to 6 heavier reps with 2 to 3 minutes rest.
- What's a good alternative to the Smith Bent Knee Good Morning?
- If you don't have access to a smith machine, the Basic Toe Touch (male) targets the same glutes using body weight instead. This alternative replicates the same joint angle and movement plane while allowing you to train effectively with different available gear. You can also substitute it seamlessly in our free Workout Plan Builder.