Back pain? Weights eased it more than cardio in a trial

New study

This is one study, not a conclusion. It does take on a question that anyone with months of nagging low back pain has asked at some point. When it hurts, are you better off with easy cardio, or should you pick up the weights?

What the trial compared

The trial was published in October 2026 in Physiotherapy Research International by Mohammed and colleagues at the Faculty of Physical Therapy, Cairo University. They randomly assigned 38 adults with nonspecific chronic low back pain, meaning pain with no single identifiable cause such as a fracture or a pinched nerve, to two groups of 19.

One group did strength training, the other aerobic training, three times a week for 8 weeks. Both programs were periodized. In plain terms, the load wasn't fixed: it was planned to step up in stages over the weeks.

According to the trial's public registration, the strength sessions mixed machines, free weights and bodyweight moves, while the aerobic group walked backward on a treadmill. So this wasn't exercise versus doing nothing. It pitted two ways of training against each other.

What the researchers found

All 38 people finished the program and the end-of-program measurements. After adjusting for where each group started, the strength group scored 2.71 points lower for pain on a 0-to-10 visual analog scale than the cardio group, and it also scored better on disability, a measure of how much the pain gets in the way of daily life.

Another difference stands out. The strength group finished with less fear of movement, which physical therapists call kinesiophobia and measure with a questionnaire. As you'd expect, it also gained more strength in the muscles that extend the hip and in the latissimus dorsi, the big muscle across the back. On the trunk endurance tests, it held out longer.

Why fear of movement matters

In September 2026, mindbodygreen covered a trial of a soft lumbar belt. It made a point anyone with a sore back will recognize. If you expect a movement to hurt, you start avoiding it, and staying active gets harder and harder.

The Cairo trial doesn't explain why strength work lowered that fear more, and it would be a stretch to guess at one. What it did measure is this: after 8 weeks of lifting progressively heavier loads, that group scored lower on fear of movement than the group that did cardio.

What the wider evidence says

This result doesn't stand alone. In 2025 the journal Disability and Rehabilitation published a systematic review and meta-analysis by Rodríguez-Domínguez and colleagues on strength training for nonspecific chronic low back pain. It pooled 10 trials with 434 people.

Compared with whatever it was tested against, strength training reduced pain intensity and disability and improved quality of life. Only the drop in pain, though, was big enough to count as clinically meaningful. The authors rate the certainty of the evidence as moderate and conclude that strength training can be recommended for this kind of pain.

The limits of this study

First, who was studied: 38 adults with nonspecific chronic low back pain, all between 18 and 45 years old according to the trial registration. No one over 45 was in this sample. People with obesity, pain running down the leg, fractures, pregnancy or inflammatory disease were excluded too.

Second, how long it lasted: the program ran for 8 weeks and results were measured only at the end, so it can't tell us whether the advantage lasts. Third, who funded it: the registration lists Cairo University itself as sponsor, with no outside funding named. Fourth, it has not yet been replicated in another group of people.

One more caveat. The two groups didn't start out equal on several measures, so the authors corrected for that with a statistical adjustment. That's the right move, but with 19 people per group any imbalance carries weight. The authors themselves call for larger trials with longer follow-up.

What this means for your workouts

If you want to try it, you could add two or three strength sessions to your week, using weights light enough to finish with good form and raising them gradually, while still walking. If the pain is new, runs down your leg or comes with tingling, it makes sense to check with your doctor first.

The practical question is usually how much weight to start with. There's a simple way to pick your load without guessing, and in this trial the weight went up in stages, never all at once. And if getting to a gym is what holds you back, another trial published in 2026 found that a video program eased back pain as well as a live class.

If you train at Gym Triple X, an easy way to start is to ask a coach on the gym floor to show you two or three basic exercises for your legs, back and core, and then to write down each week what weight you used and how your back felt the next day.

How much strength work a cranky back can take depends on your history and on how you respond along the way. If it helps, a personal trainer on the Costa del Sol can help you build that progression gradually, one week at a time.