Upper Legs Exercise · Sled Machine
Sled Closer Hack Squat
- Category
- Upper Legs
- Equipment
- Sled Machine
- Target
- Glutes
Biomechanical cues verified by the PlanWorkouts Science Review Board under CSCS editorial oversight; see our editorial standards.
The Sled Closer Hack Squat is a compound upper legs movement designed to train the Glutes with direct engagement of the Hamstrings, Calves.
Operates primarily in the sagittal plane involving knee flexion/extension and hip extension. Peak mechanical tension occurs in the deep lengthened position at the bottom transition. Maintain midfoot balance and an upright torso angle. Executing this with strict form maximizes muscle fiber recruitment while protecting joint structures.
Quick Exercise Facts
Target Muscle Activation
A narrower foot placement on the sled hack squat shifts more emphasis onto the quads specifically, similar to how a narrow stance changes a regular squat. The sled's fixed path takes the balance demand out, which lets you push closer to failure safely than you could with a free hack squat. It's a good option for isolating quad development once compound squatting is already in the program.
How to Do the Sled Closer Hack Squat
- Set the sled machine to a comfortable weight and position your back against the pad.
- Place your feet shoulder-width apart on the platform, toes turned out slightly.
- Hold the side handles of the machine for stability.
- Brace your core and bend your knees and hips to slowly lower your body, keeping your back straight.
- Keep lowering until your thighs reach parallel to the floor or slightly beyond.
- Hold briefly at the bottom, then push through your heels to straighten your legs and return to start.
- Execute the desired number of reps with smooth cadence and consistent focus on 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
Operates primarily in the sagittal plane involving knee flexion/extension and hip extension. Peak mechanical tension occurs in the deep lengthened position at the bottom transition. Maintain midfoot balance and an upright torso angle.
Common Mechanical Mistakes & Form Errors to Avoid
- Knee Valgus (Inward Collapse): Allowing knees to cave inward during the ascent places excessive tensile stress on the MCL and lateral meniscus. Drive knees out in line with second toes.
- Excessive Forward Pitch: Allowing the chest to drop and hips to shoot up turns the squat into a good-morning, transferring load off the quadriceps onto the lumbar erectors.
- Heel Lift & Weight Shift: Shifting balance forward onto the balls of the feet compromises stability and increases patellar tendon strain. Keep weight distributed over midfoot.
Proper Breathing Patterns & Core Engagement
Perform a deep abdominal brace (Valsalva maneuver) into the diaphragm before initiating descent. Hold intra-abdominal pressure through the bottom transition, exhaling past the sticking point on ascent.
Add the Sled Closer Hack Squat to Your Custom Workout Routine
Build a personalized, science-backed workout plan matching your training goals, equipment access, and schedule.
Injury Modification & Joint Safety
Lifters experiencing acute patellofemoral knee discomfort should moderate depth to parallel or utilize box squats to reduce peak anterior patellar shear. If joint irritation persists, immediately stop and substitute this movement with another exercise from the Upper Legs exercises category.
Muscles Worked
The Sled Closer Hack Squat primarily targets the Glutes, with Quadriceps as the primary synergist muscle group, along with the Hamstrings, Calves.
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 sled machine? These target the same glutes with different equipment.
FAQ
- What muscles does the Sled Closer Hack Squat work?
- The Sled Closer Hack Squat primarily targets the glutes as the primary agonist. Synergist assistance is provided by the quadriceps along with the hamstrings, calves. 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 Sled Closer Hack Squat?
- The Sled Closer Hack Squat is performed using a sled 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 Sled Closer Hack Squat?
- The most frequent error is knee valgus (inward collapse): Allowing knees to cave inward during the ascent places excessive tensile stress on the MCL and lateral meniscus. Drive knees out in line with second toes.. 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 Sled Closer Hack Squat?
- 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 Sled Closer Hack Squat?
- If you don't have access to a sled 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.