Why your back hurts after the Gym (and it’s not just because of deadlifts)

If you’ve ever walked out of the gym with a sore or tight lower back, it’s easy to blame exercises like deadlifts, squats, or RDLs.

But the truth is…….

Those lifts aren’t always the real problem.

A lot of the time, back discomfort after training comes down to something most people overlook:

Accumulated Spinal Extensor Fatigue

Your lumbar and thoracic extensors play a key role in almost every strength session.

Most people associate them with big compound lifts like:

Deadlifts / Squats / Romanian deadlifts / Hip thrusts

But what many don’t realise is that these muscles are working throughout your entire workout, not just during those exercises.

You may need to rethink your training regime as your back may be working more than you think

Your spinal extensors are responsible for keeping your spine stable and work to support it whilst doing most gym exercises.

This means they’re heavily involved in exercises like:

Bent over rows / Single arm dumbbell rows / Lunges and split squats / Overhead pressing

Farmer carries / Kettlebell swings / Even core exercises

In other words…

They could be working for almost the entire session.

The biggest issue with this is that by the time you get to your heavier compound lifts, your spinal extensors may already be fatigued.

When these muscles fatigue, a few things can happen:

Reduced spinal stiffness / Decreased control under load / Increased reliance on passive structures (like ligaments and joints)

Changes in how force is distributed through your lower back may also occur.

This is often when pain / discomfort starts to show up.

And it’s why many people say:

“Deadlifts hurt my back.”

When in reality, the issue may be how much cumulative load your spine has already handled before you even get to that lift.

Part 2 next week will deep dive into how you can substitute out certain exercises to save your extensor muscles.