FitnessAI45° back extension machine
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How to do it
45° back extension machine. Greater ROM than flat. Trains lumbar extensors, glutes and hamstrings.
Muscles worked
Mainly lumbar. Train it inside a balanced routine to progress safely.
Technical sheet
- Movement pattern
- Hip hinge
- Minimum level
- Beginner
- Technical demand
- Basic
- Fatigue it generates
- Moderate (0.9 out of 2.2)
- Risk if technique breaks down
- Medium
- Peak tension in the stretched position
These are the values the generator uses to decide where the exercise goes within the session.
Recommended sets and reps
As a compound lift, it fits in 3–5 sets of 5–12 reps leaving 1–3 reps in reserve (RIR). Prioritize it at the start of the session, when you're fresh.
Common mistakes to avoid
- Hyperextending the lower back at the top of the movement instead of finishing in a neutral position.
- Using too much weight at the cost of technique and full range of motion.
- Doing reps too fast, without controlling the eccentric (lowering) phase.
Alternative exercises
More Hip hinge exercises
Add it to your routine
FitnessAI can generate a personalized routine that includes 45° back extension machine based on your level, goal and available days.
Build your Lower back workout
Generate a full routine with the emphasis on Lower back and 45° back extension machine among your preferred exercises. Free, no sign-up.
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Frequently asked questions
What muscles does 45° back extension machine work?
45° back extension machine mainly works the lumbar muscle group, plus synergist and stabilizer muscles depending on the variation.
How many sets of 45° back extension machine should I do?
Between 3 and 5 sets per session, adjusting the total weekly volume for lumbar to your level (about 10–20 sets per muscle per week).
Is 45° back extension machine good for building muscle?
Yes. Combined with progressive overload, good technique and enough rest, it's an effective tool to grow lumbar.
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