GHD sit-up
The GHD sit-up is powerful and demanding. Learn the setup, the range, beginner faults, why volume starts small, and the sit-up steps that come before it.
What the ghd sit-up is
A GHD sit-up is a core movement performed on a glute ham developer, where you sit with the feet locked in, lean back past parallel and then sit up powerfully using the abs, hip flexors and a drive from the legs. It trains the trunk through a large range of motion. Beginners start with floor sit-ups and a small range on the machine with very low volume.
Why it is in class
The GHD sit-up is in CrossFit because it trains the trunk through a range of motion a floor sit-up cannot reach, and it teaches the hip flexors and abdominals to work together explosively. That snap from extended to flexed shows up in kipping, in jumping and in getting up from the ground quickly. It is also one of the most intense movements for the midline, which is exactly why coaches introduce it slowly. In daily life, a strong, responsive midline helps you sit up from bed or the floor without using your arms, recover your balance when you lean too far back, and keep your spine steady while lifting.
Points of performance
What a good rep looks like, from setup to finish.
Set the machine
Adjust the foot plate so that when you sit on the pad, your hips sit just off the front edge with your thighs supported. Too far forward and the movement strains the lower back; too far back and you cannot reach full range. Ask your coach to check the fit.
Feet locked, knees bent
Hook the feet firmly under the rollers with the knees slightly bent at the start. That bend is what lets the legs help drive the sit-up. Locked straight knees take the legs out of the movement and leave the abs and lower back to do everything.
Lean back with control
Cross the arms over the chest or let them reach overhead and lower the torso back under control. Beginners stop at or just below parallel to the floor. Experienced athletes may reach back to touch the floor, but that depth is earned slowly.
Drive with the legs
From the bottom, extend the knees forcefully by pushing into the foot pads. That kick, combined with the abs and hip flexors, brings the torso up quickly. The legs and trunk work together, which is what makes the GHD sit-up so powerful.
Finish tall
Sit all the way up until the shoulders are over the hips, and reach forward to touch the feet or foot plate in a standard workout. Then return back under control. Keep a steady rhythm instead of collapsing back with gravity.
Common beginner faults, and the fix
Too much, too soon
What it looks likeA beginner does a high number of reps in the first session and feels fine at the time.
The fixStart with a very small number of reps, as your coach directs, and build over weeks. GHD soreness can arrive days later and can be severe.
Hips off the pad
What it looks likeThe athlete slides too far forward so the lower back hangs unsupported.
The fixAdjust the foot plate so the hips sit just off the edge of the pad with the thighs fully supported.
Straight locked knees
What it looks likeThe legs stay rigid and the athlete grinds up using only the stomach and lower back.
The fixStart with a slight knee bend and push hard through the feet at the bottom to drive the rep.
Dropping back
What it looks likeThe torso crashes back to the bottom with no control, jerking the neck and back.
The fixLower at a steady pace and limit range to parallel until control is consistent.
Where you start, and where it goes
Every movement in class has a version that fits you today.
Start here
Floor sit-ups with an abdominal mat under the lower back, plus hollow body holds.
Next step when: When you can do sets of twenty smooth floor sit-ups and hold a hollow position steadily.
Building
A handful of GHD sit-ups to parallel with your coach watching, plus GHD back extensions for the back of the body.
Next step when: When a few reps cause no unusual soreness over the following days and your coach sees control at parallel.
Full movement
GHD sit-ups with the torso dropping below parallel and a full sit up to touch the feet, in modest sets.
Next step when: When moderate sets feel controlled and recovery is normal, volume can grow gradually under coaching.
Beyond
Full range GHD sit-ups touching the floor behind you, larger sets in workouts, and weighted holds.
Next step when: Keep volume increases small and steady, and keep floor core work in your training alongside the machine.
Learning it in your first classes
The GHD sit-up is rarely a first day movement for a true beginner, and when it appears early it comes in small doses. Your coach will fit the machine to your body, show you where the hips go and have you try a few reps to about parallel. They watch your knee bend, how you control the way back and how you sit up. Tell the coach about any back, neck or hip history before you get on. Let them know too if you notice unusual soreness, dark urine or swelling in the days after any hard session, and seek medical care if that happens.
What your first class at O-SEA CrossFit is like · How On-Ramp teaches the movements
Questions beginners ask
Why do coaches limit GHD sit-ups for beginners?
Coaches limit GHD sit-ups because the movement is extremely demanding on the abdominals and hip flexors, and soreness can arrive a day or two later, well after you felt fine. Too much volume early can lead to severe soreness and, in rare cases, serious muscle breakdown. Starting small lets your body adapt to the GHD sit-up.
Is the GHD sit-up bad for my lower back?
The GHD sit-up is not inherently bad for the lower back, but poor setup and too much range too soon can stress it. Fit the machine so the hips are supported, keep a slight bend in the knees and limit depth to parallel at first. If you have a back history, tell your coach and check with a doctor or physical therapist first.
What can I do instead of GHD sit-ups?
Common substitutes for a GHD sit-up are floor sit-ups with an abdominal mat, hollow rocks and V-ups. Your coach chooses a GHD sit-up substitute that keeps the intent of the workout, usually a similar amount of trunk work at a similar pace, without the volume risk of the machine for newer athletes.
Do I need to touch the floor behind me on a GHD sit-up?
No. Touching the floor behind you is a full range GHD sit-up that experienced athletes build toward over time. Beginners lean back to around parallel. Many workout standards ask for the shoulders to pass parallel and the hands to touch the feet or foot plate at the top, so extreme depth is not required.
Why am I so sore days after GHD sit-ups?
Soreness from GHD sit-ups often peaks two or three days later because the movement stretches and loads the abdominals and hip flexors through a long range. Mild soreness is expected. Severe pain, swelling or dark urine is not, and needs prompt medical attention. Tell your coach so they can plan your next sessions.
Related movements
Learn the ghd sit-up with a coach beside you
Every class at O-SEA CrossFit is coached and every movement scales. Your first one is free.