Back extensions: how to perform them.
Back extensions are the insurance policy for the posterior chain: lower back, glutes and hamstrings learning to work together on a simple machine. The name is misleading: the last thing you want to do is "hyperextend" your spine. The real movement starts at the hip.
Starting position
- Bench pad set just below the hip bones: the pelvis needs to rotate freely.
- Ankles locked under the rollers, body in a straight line.
- Hands crossed on chest to start; behind the head or holding a plate once you need more load.
Proper form
- Start in a straight line from heels to head, spine neutral.
- Lower by flexing at the hip, not by rounding your back: the torso comes down as one solid block.
- Stop where you feel the hamstrings pulling and the spine is still neutral, usually around 60-80° of hip flexion.
- Drive back up squeezing glutes and hamstrings until you reach the starting line.
- No swinging back at the top: the straight line is the finish point, anything past it is just lower back compression.
When to inhale, when to exhale
Inhale on the way down, exhale on the way up. A slightly braced core protects your lower back throughout the range.
Mistakes to avoid
Rising past the body line by arching your back loads the lumbar vertebrae under compression. The movement ends when you're straight: the exercise's name is a promise you shouldn't keep.
If the edge locks the pelvis, hip rotation disappears and every rep turns into pure lumbar flexion. The pad supports your thighs, not your stomach.
Bouncing at the bottom and jerking up takes the work away from the exact muscles you're trying to train. Two seconds down, two seconds up.
DAWT tip. Want to shift the emphasis onto the glutes? Toes pointed slightly out, back deliberately kept a touch rounded (a gentle, controlled kyphosis), and drive up thinking only about squeezing your glutes: same bench, almost a different exercise.
Variations and alternatives
Quick answers
Are back extensions good or bad for your back?
Performed from the hip, with a neutral spine and without going past the body line, they strengthen the lower back and glutes and are a solid preventive exercise. They're only harmful in the version the name suggests: forcing the extension past that line.
Are 45° back extensions better than horizontal ones?
The 45° bench is easier to dose and loads more of the bottom portion of the movement; the horizontal version concentrates the difficulty at the top. For most training programs, the 45° is the practical choice.
Related exercises
How much should you load on this exercise?
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