Physio, App or YouTube: Which to Use and When

The short answer: See a physical therapist or provider first if your pain is severe, followed an injury, spreads down a leg, causes weakness or numbness, or is not improving. An app can help with mild to moderate pain once serious causes are unlikely. YouTube suits learning a move you have already been given, if you choose clinician-made videos.

• A large trial in chronic knee pain found video-call physiotherapy was non-inferior to in-person care at 3 months [1]. We found no equivalent proof for other body areas.
• A small average benefit has been shown for digital exercise programs versus usual care, but results vary a lot [3]. AI tools for low back pain showed small gains with low certainty [4].
• The American College of Physicians lists exercise as a first-line option for chronic low back pain, and notes acute low back pain usually improves substantially within a month [7].
• On YouTube, clinician-made videos tended to be higher quality, and view counts did not predict quality [5][6].
• Emergency signs, such as back pain after trauma, new bladder or bowel changes or fever, mean get care first [8].
• In the US, every state has lifted all or some referral requirements for physical therapists, though the scope varies [9].

Start with the problem, not the product. This table is our clinical summary of the options. It is a guide, not a diagnosis.

The "Best for" and "Can examine" rows are clinical judgment, not trial findings. The evidence row is from the sources cited.

If you have any of these, get checked before you try an app or video. Mayo Clinic advises [8]:

• Emergency care for back pain after trauma, such as a car crash, bad fall or sports injury, with new bladder or bowel control problems, or with a fever.
• A doctor's visit if pain has not improved after a week of home treatment, is constant or intense, especially at night or when lying down, spreads down one or both legs (especially below the knee), comes with weakness, numbness or tingling in one or both legs, comes with unintended weight loss, or comes with swelling or a change in skin color on the back.

Our posts on when lower back pain is serious and how long sciatica lasts go further. The same logic applies to other body areas: a joint you cannot put weight on, or one that is hot, red and swollen, needs a clinician first.

A physical therapist can also be your first stop. APTA says every state has lifted all or some referral requirements, so you can often see one without a referral, but the scope varies by state [9]. Outside the US, rules differ.

For some problems, it appears so. The best evidence is in knee conditions.

• The PEAK trial. In a 2024 Lancet trial, 394 Australian adults with chronic knee pain were randomly assigned to 5 physiotherapy consultations over 3 months, either by video call or in person. Both groups got strengthening, physical activity and education. Pain fell by 3.14 points (video) and 2.98 points (in person) on a 0 to 10 scale, a difference of 0.16 (95% CI -0.26 to 0.57), and the authors reported video was non-inferior. Adverse events were similar (19% vs 21%) and none were serious. The trial was not blinded, and it studied knee pain consistent with osteoarthritis only [1].
• A 2023 review. It pooled 5 trials (402 participants) in knee osteoarthritis and after knee replacement. It found no significant differences in pain or function between telehealth and face-to-face care. The authors described the evidence as limited and low quality and urged caution [2].

What this means: with a real physical therapist, video-call care can work as well as in-person care for chronic knee pain. It does not show the same for back pain, shoulders or complex injuries, and it does not apply to an app with no clinician.

A little, on average, and the evidence is uncertain. Our fuller breakdown is in does an AI physio app actually work. In short:

• Digital programs. A 2022 review of 56 randomized trials (9,359 participants) found digital interventions reduced musculoskeletal pain and improved function compared with usual care, with small effects (standardized mean difference 0.19 for pain and 0.14 for function) and high variation between studies [3].
• AI tools for low back pain. A 2026 meta-analysis of 5 trials (1,939 people; 3 trials pooled) found small improvements that did not reach the threshold usually counted as meaningful, with low or very low certainty. The authors said AI tools may be a supplementary option and should not replace first-line treatment [4].
• First-line care. The American College of Physicians lists exercise as a first-line option for chronic low back pain, though benefits are small ("minimal improvement" versus no exercise, moderate-quality evidence). It also says acute low back pain usually improves substantially within one month and advises staying as active as pain allows [7].

An app can help you stick with exercise, which matters because the first-line advice is to exercise. It cannot diagnose or replace urgent care. Loosn's own description of Kai, its AI physio coach, is a short daily session adjusted by a quick check-in [10]. Kai is a movement-coaching tool, not a physical therapy service. To compare Loosn with other options, see our compare hub, including the pages for Hinge Health, Sword Health and Joint Academy, which involve care teams. Those pages are Loosn's own product summaries, not independent reviews.

Sometimes, if you choose carefully. Free videos can show you how a move looks, but quality varies and nobody checks your back.

• A 2023 study analyzed 173 English-language YouTube videos on exercise for low back pain. Clinician-uploaded videos were higher quality, and so were more recent ones. Non-medical uploaders' videos had lower quality scores [5].
• A 2021 study of the 76 analyzed videos (from 240 screened) on exercises for lumbar disc herniation rated overall quality as moderate. View and like counts had no significant link to quality, and the authors concluded YouTube videos cannot be universally recommended for therapy advice [6].

Practical rules, from our clinical view, not a validated tool:

1. Prefer videos by a named physical therapist or other licensed clinician.
2. Do not pick on views or likes [6].
3. Use videos to learn a move you have been given, not to diagnose yourself.
4. Stop if the move increases your pain, causes numbness, or sends pain down a leg.
5. Be wary of promises to "fix" or "cure" pain in minutes.

Work through these in order. This is our suggestion and is not a tested decision tool.

1. Any red flag? Get care first (see the box below).
2. New injury, severe pain, nerve symptoms, or recent surgery? See a physical therapist or provider.
3. Pain not improving after about a week of home care? Book a visit [8].
4. Mild to moderate, checked, no red flags? An app or a clinician-made video may help you stay consistent. Consider asking a physical therapist for a plan first.
5. Already tried apps or videos and not improving? Move up to a physical therapist.

Whatever you choose, check in on how you are doing every week or two. If pain is getting worse, change the plan. For a deeper look at app safety, see our post on does an AI physio app actually work, and our guide to how Loosn works. The physical therapist glossary entry explains what physical therapists do.

If you have any of these, see a clinician first, before an app or a video.

Emergency: call 911 (or your local emergency number) or go to the emergency department if [8]:

• back pain starts after trauma, such as a car crash, bad fall or sports injury
• you have new bladder or bowel control problems
• back pain comes with a fever
• you have numbness around your groin, genitals or inner thighs ("saddle numbness"), or rapidly worsening leg weakness

(Other common emergency numbers are 999 in the UK, 112 across the EU and 000 in Australia.)

Get urgent help the same day if:

• you cannot put weight on a leg or joint after an injury
• a joint is hot, red and swollen, or you have a fever

See a provider soon if [8]:

• pain has not improved after a week of home treatment
• pain is constant or intense, especially at night or when lying down
• pain spreads down one or both legs, especially below the knee
• you have weakness, numbness or tingling in one or both legs
• you have unintended weight loss with back pain
• you have swelling or a change in skin color on your back

Loosn is not a substitute for assessment when symptoms are severe, getting worse or unusual.

Should I see a physio or use an app for back pain? 

See a physical therapist or provider first if your pain is severe, followed an injury, spreads down a leg, causes weakness or numbness, or has not improved after a week of home care [8]. An app may suit mild to moderate pain once serious causes are unlikely, as a supplement. Reviews of AI tools for low back pain suggest small gains with low certainty [4].

Is online physio as good as in-person? 

For chronic knee pain, one large Australian trial of 394 adults found video-call physiotherapy was non-inferior to in-person at 3 months [1]. A review of 5 trials in knee conditions found no significant difference but called the evidence limited and low quality [2]. We found no equivalent proof for other body areas.

Are YouTube exercise videos safe and good enough? 

Quality varies. A study of 173 low back pain videos found those uploaded by clinicians were higher quality [5], and a study of 76 disc herniation videos found view and like counts did not track quality [6]. If you use YouTube, choose clinician-made videos and stop if pain increases. Videos cannot examine you.

Do I need a referral to see a physical therapist? 

In the US, APTA says every state has lifted all or some referral requirements, so a physical therapist can often evaluate and treat you without a referral, but the scope varies by state [9]. Outside the US, rules differ. Check with your insurer or local provider about coverage and any referral rules.

Can an exercise app replace a physiotherapist? 

Not for everyone. Trials do not show an app is as good as a good physical therapist for you [3][4], and apps cannot examine you, test nerve function or rule out serious causes. The American College of Physicians lists exercise as a first-line option for chronic low back pain [7], and an app may help you keep doing it.

When do I need to see a clinician first? 

Mayo Clinic advises emergency care for back pain after trauma, with new bladder or bowel control problems, or with fever [8]. Book a visit if pain is constant or worse at night, spreads below the knee, comes with leg weakness, numbness or tingling, or unintended weight loss, or has not improved after a week [8]. Do not start with an app.

If a check-up has cleared you for gentle exercise, download the Loosn app and ask Kai, Loosn's AI physio coach, for a short daily session that fits your pain. See how Loosn works and get the app.