General Info

The latissimus dorsi is a broad, flat muscle that covers much of the lower posterior thorax. It plays a key role in several movements of the shoulder joint, including

  • extension
  • adduction
  • transverse extension (also known as horizontal abduction or horizontal extension)
  • flexion from an extended position
  • medial internal rotation

Additionally, the latissimus dorsi contributes to the extension and lateral flexion of the lumbar spine.

Functionally, this muscle is integral to scapular motion, as it can pull the inferior angle of the scapula in various directions, facilitating movements such as internal rotation, adduction, and extension of the arm.

Overactivity of the latissimus dorsi can lead to issues with both the shoulder and lower back, although these problems are not always directly related.

Our Expert Physio

Cameron Lillicrap has spent over 40 years on both sides of elite sport, as an international rugby player and as Australian Rugby's Team Physiotherapist, trusted to keep some of Australia's most successful athletes on the field. His practical, focus-on-what-you-can-do approach is why people seek his advice when their rehab isn't working. He knows what's needed to get you back 'in the game'.

We asked Cam about Lats.

Here's what he said...

Q&A with Cam

Who is most likely to suffer tight Lats?

The most common group I see is gym-goers with technique problems - specifically people who are using their lats to do back extension work during squats and deadlifts instead of engaging the erector spinae where that load belongs. The lats take over, get overworked, and tighten up. Poor postural control and weak core muscles usually sit underneath that pattern.

Swimmers and gymnasts are also high on the list. Both sports demand enormous lat activation repeatedly, and without adequate recovery and flexibility work the muscle stays shortened and overactive.

The third group is anyone who sits or slouches for long periods. Tight lats pull the shoulders forward and down, which is why you'll often see that characteristic rounded shoulder posture with the thumbs naturally rotating inward when the arms hang relaxed. That's the lats - short, tight, and pulling everything toward internal rotation.

In all three groups, the problem isn't just local tightness. Overactive lats affect shoulder function, weaken the external rotators, and can feed directly into lower back pain. It's a muscle that causes problems well beyond where it lives.

You need to work on three things at once: release the tightness, restore flexibility, and then rebuild the muscle balance the tight lats have disrupted.

Release and mobilise:

  • Trigger the thoracic paraspinals and lats directly with a Massage Ball or Pocket Physio MAX to alleviate local tightness
  • Stretch the lats properly with a Stretchband - this is one muscle where technique in the stretch really matters, so take the time to get the position right

Restore shoulder balance:

  • Strengthen the external rotators with a red Power Band - the lats are powerful internal rotators, and when they're overactive they dominate the shoulder. The external rotators need to be strong enough to balance that out

Rebuild core control:

  • Strengthen the deep core with Posture Pro Dome exercises. This is what allows you to stop relying on the lats as a back stabiliser during squats and heavy lifts, which is usually how the overactivity started in the first place

Absolutely...and it's more direct than most people realise. The latissimus dorsi attaches into the lumbar spine and pelvis, so when it's tight and overactive it pulls on those structures constantly, even at rest.

During loaded movements like squats and shoulder presses, overactive lats disrupt the coordination between the core muscles that are supposed to be stabilising the lower back. When the lats dominate, the deep stabilisers switch off - and the lower back pays for it.

Symptoms are often a combination of local muscle tightness through the mid and lower back, pain at the shoulder, and a general sense of restricted movement. If your lower back tightens up during or after gym sessions, the lats are one of the first places I'd look.