Can a Personal Trainer Help With Injuries? Where a Physio Stops
Old injuries are incredibly common after 40, like a bad knee, a bad shoulder or a lower back that flares up. Weight training can help with that.

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A client came to me who was finishing up physio for a shoulder issue. They had basically stopped doing any pressing movements, meaning pushing a weight away from you. It was out of fear more than necessity.
We rebuilt it gradually, and that client was back to full pressing within a few months. Of course I get that people are scared of getting back into what actually injured them. But once we rebuild that movement, it helps even more.
That is what I do as a personal trainer, once it is clear what is safe to load. I’ve coached for 18+ years, almost entirely men and women between 40 and 65. I train them at UNTIL Soho, Marylebone, Liverpool Street and Canary Wharf, and online (more on my about page).
Do many new clients start training with an injury?
It’s common for a new client to come in with an existing or old injury they’re managing. It might be a bad knee, a bad shoulder, or a lower back that flares up.
I reassure them that weight training can help with that as well, for sure. I’m a personal trainer, so I don’t diagnose or treat injuries. Where a client has an injury or a medical condition, I work alongside their medical team.
My return to training coaching is built for clients like these. If you’d rather train online with weekly support, take a look at my 40+ Reset Programme.
What goes wrong in the first month back after physio?
After physio, I see people either avoid the injured area completely out of fear, or go back too hard too soon because they feel fixed.
For both problems, the first month is about rebuilding confidence in the injured movement at a sensitive load, meaning a careful amount of weight, and not rushing it at all.
What should a trainer ask about an old injury in a first session?
I always ask what the injury is, early in a first session. My first questions go like this.
- What is the injury?
- When did it happen?
- What was done about it, if anything?
- Does it still cause discomfort?
I also use a pre-exercise questionnaire. That’s absolutely key to knowing what someone’s actual injuries are.
What makes me pause is sharp pain. If somebody still has sharp pain, I want them to get proper clearance before we put weight through it again. You can see how a first session runs in what to expect from your first personal training session.
When should you see a GP or physiotherapist before you train?
I send a new client to a GP or physio first when the pain is ongoing, or when I am unsure it is only stiffness. I want to be clear on what’s actually safe to load, and not guess.
If a niggle flares into a new sprain or strain, the NHS says to see a GP if it is getting worse or not feeling better after treating it yourself. It also says to contact NHS 111 if you cannot put any weight on it or walk more than a few steps.
In many areas you may be able to get NHS physiotherapy without a GP referral, through community muscle, bone and joint (MSK) services. There may be a long waiting list.
Where does a physio stop and a personal trainer start?
I step back to a GP or physio when I am not confident. Once it is clear what is safe to load, I rebuild the movement.
A trainer cannot call themselves a physiotherapist unless they are registered with the Health and Care Professions Council. In the UK, that is a title protected by law.
An experienced personal trainer needs to know when they’re not a physio or an osteopath. You need to actually take a step back and go, “OK, I’m not confident here, so let’s go and get a bit more advice.”
Frequently asked questions
Can you train with an old injury after 40?
Old injuries and niggles are incredibly common after 40, and Neil McGuigan of NMG Fitness reassures clients that weight training can help with them as well. He sends clients with ongoing pain to a GP or physio first, and sharp pain needs proper clearance before he puts weight through it.
Should I avoid an injured shoulder after physio?
Avoiding it completely out of fear is a common mistake, says Neil McGuigan. One client finishing physio had stopped pressing out of fear more than necessity. Neil rebuilt it with them gradually, and they were back to full pressing within a few months. Sharp pain still needs proper clearance first.
Can a personal trainer diagnose an injury?
No. NMG Fitness is a personal training service, and Neil does not diagnose or treat injuries. If there is ongoing pain, or he is not confident it is general stiffness, he sends the client to a GP or physiotherapist first, then trains alongside their advice.
Can I see an NHS physiotherapist without going to my GP?
In many areas, yes. The NHS says you may be able to refer yourself to community muscle, bone and joint (MSK) services for physiotherapy without a GP referral, though there may be a long waiting list.


