Machine Back Extension
The machine back extension is a hip hinge for the lower back (spinal erectors), done on a machine. It also works the glutes and hamstrings. On weyt.ai it counts toward Balance as Back (minimum 10 sets per 30 days) and toward your 12-week strength trend at the weight you log.
At a glance
| Muscle group | Lower Back |
|---|---|
| Primary muscles | lower back (spinal erectors) |
| Secondary muscles | glutes, hamstrings |
| Equipment | Machine |
| Logged as | Reps per set |
| Strength scoring | Counts as a lift |
| Balance group | Back · minimum 10 sets per 30 days |
| Strength standards | none (standards exist for barbell and dumbbell lifts with published norms) |
How weyt.ai scores it
- Balance: every logged set counts toward the Back group, which needs at least 10 sets per 30 days for full credit.
- Strength: counts as a lift. Your best working set each session feeds a best lift estimate (an estimated one-rep max) per lift, read over 12 weeks on the Strength screen.
- Routine: any session that includes it counts toward your weekly target, the 4-week consistency window and your streak.
Scoring is plain arithmetic, not AI: the same sets always give the same result. Read the method on the about page.
Also called
back extension machine, lower back machine, seated back extension, machine lower back extension
Log it under any of these names and weyt.ai files it under the same exercise, so your history never splits across spellings.
Related back exercises
Everything else that counts as back
Bent Over Barbell Row · Pendlay Row · Underhand Barbell Row · T-Bar Row · Single-Arm Dumbbell Row · Dumbbell Bent-Over Row · Dumbbell Rear Delt Row · Incline Dumbbell Row · Renegade Row · Seated Cable Row · Standing Cable Row · Single-Arm Cable Row · Inverted Row · Resistance Band Row · Kettlebell Row · Lat Pulldown · Wide Grip Lat Pulldown · Close Grip Lat Pulldown · Reverse Grip Lat Pulldown · Straight-Arm Pulldown · Pull-Up · Chin-Up · Weighted Pull-Up · Cable Pullover · Dumbbell Pullover · Cable Face Pull · Band Face Pull · Band Pull-Apart · Barbell Shrug · Dumbbell Shrug · Farmer's Walk · Barbell Deadlift · Trap Bar Deadlift · Dumbbell Deadlift · Dumbbell Suitcase Deadlift · Kettlebell Deadlift · Ski Erg · Rowing Erg · Sled Pull · Chest-Supported T-Bar Row · Meadows Row · Barbell Seal Row · Smith Machine Row · Resistance Band Lat Pulldown · Single-Arm Lat Pulldown · Machine Pullover · Neutral-Grip Pull-Up · Negative Pull-Up · Muscle-Up · Scapular Pull-Up · Prone Y Raise · Cable Shrug · Smith Machine Shrug · Snatch-Grip Deadlift · Deficit Deadlift · Trap Bar Carry · Swim