How Often to Do Back Extensions for Lower Back Strength

Updated September 25, 2026 · 2 min read · 3 sources

Written for adults with long-running low back pain who are cleared to exercise. I have no medical training; this is the method I used and what the research says about it. Some symptoms need a doctor before any exercise: check the red flags.

Two or three sessions a week, with at least one rest day between them. Monday, Wednesday, Friday works. So does Tuesday and Saturday. A session takes about 10 minutes. The app does not lock days, so keeping the rest days is up to you.

The schedule by stage

Stage	Sessions a week	Rest between sets
Floor Foundations, until you have a bench	2 or 3	60 s between rounds
Stage 1, isometric holds	2 or 3	60 s
Stage 2, partial reps	2 or 3	60 s
Stage 3, full reps	2 or 3	90 s
Stage 4, weighted reps	2 or 3	120 s
Maintenance, offered after 6 weighted sessions and 14 days of logs at or below baseline	About 2 at your current load	Same as Stage 4

The progression guide covers what each stage involves.

Why a day between sessions

The program reads the next morning to set the next session. Train on back-to-back days and the second session happens before you have that reading, so two changes stack up before you can see what the first one did. A rest day also gives ordinary training soreness time to settle.

A good week makes an extra day tempting. In the sample training log, the one extra session in the month comes right before the flare.

What the frequency studies found

Graves and colleagues trained 114 adults on an isolated lumbar-extension machine for 12 weeks, in groups that trained every other week, once, twice, or 3 times a week. Every training group gained lumbar strength compared with the group that did not train, with no statistical difference among them, though the every-other-week group's training weights rose less. The authors concluded that once a week was enough to build lumbar-extension strength.

Tucci and colleagues then took 50 people who had trained for 10 or 12 weeks and cut them to one session every 2 or every 4 weeks, at the same effort and volume. Their strength held for the 12 weeks of the study. The 10 people who stopped training lost much of theirs.

Both studies used machines that hold the pelvis still, and both measured strength, not back pain. They show that lumbar strength responds to infrequent training. They do not set a schedule for a 45-degree bench or for a sore back.

Why the program uses two or three

Once a week built strength in those studies. The program still uses 2 or 3 sessions because each one is small and each one produces a next-morning reading, and more readings let the dose change in smaller steps. The ACSM position stand on resistance training also recommends 2 to 3 days a week for beginners.

Maintenance

After 6 or more weighted sessions and 14 days of pain logs at or below baseline, the app offers maintenance: about two sessions a week at your current load. A log above baseline switches maintenance off, and the normal rules take over.

Two a week is more than the Tucci study needed. I keep it there because it keeps the movement familiar and keeps pain logs coming, so drift shows up early.

Missed sessions

Do not make up missed sessions by stacking them. After 7 or more days off, the app eases the next session whatever the logs say, and the next-morning logs bring the dose back up from there.

Sources

Graves JE, Pollock ML, Foster D, et al. Effect of training frequency and specificity on isometric lumbar extension strength. Spine. 1990;15(6):504–509. link
Tucci JT, Carpenter DM, Pollock ML, Graves JE, Leggett SH. Effect of reduced frequency of training and detraining on lumbar extension strength. Spine. 1992;17(12):1497–1501. link
American College of Sports Medicine. Progression models in resistance training for healthy adults. Med Sci Sports Exerc. 2009;41(3):687–708. link

The app

I built Low Back Pain Coach to run this program: it reads your pain logs, writes the next session, and a voice counts the holds, reps and rest. A notebook can run the same rules if you would rather keep the decisions on paper.