How to Start a Personal Training Business in the UK: A Step-by-Step Guide

To start a PT business in the UK: (1) get a Level 3 Diploma in Personal Training (after your Level 2 Gym Instructor); (2) get public liability and professional indemnity insurance, from about £100/year; (3) register as a sole trader with HMRC; (4) pick where you'll train — gym floor rent runs £200–£750/month; (5) get your first clients and one tool to run them. Here's each step in plain English.

Becoming a PT is the easy part. Building a business is the bit the course skips. This covers both. Do it in order.

Step 1 — Get qualified

You need two qualifications:

• Level 2 Gym Instructor — lets you run gym inductions. Not one-to-one PT.
• Level 3 Diploma in Personal Training — the industry standard. This is the one that lets you train clients one-to-one, write programmes and work for yourself.

Make sure the course is Ofqual-regulated and CIMSPA-endorsed — insurers and gyms check for it, and without it they won't cover or hire you. Many providers bundle Level 2 and Level 3 so you qualify in one run.

Step 2 — Get insured

Don't train a single client without it. You need:

• Public liability insurance — covers you if a client or bystander is injured or property is damaged.
• Professional indemnity insurance — covers you if a client claims your advice caused harm.

This starts from about £100 a year. Most insurers want proof of your Level 3 before they'll cover you.

Step 3 — Register as a sole trader with HMRC

About 80% of UK PTs are self-employed sole traders. It's the simplest setup.

• Register with HMRC for Self Assessment once your self-employed income passes £1,000 in a tax year.
• Register by 5 October after the end of the tax year you started trading.
• File your first return online by 31 January the following year.

You pay Income Tax on your profits (income minus allowable expenses) and Class 4 National Insurance. Class 2 NI was scrapped from April 2024.

Keep records of all income and expenses for six years. A spreadsheet or an accounting app does the job at first.

You only register for VAT once sales pass £90,000 in a rolling 12 months — a long way off at the start.

Allowable expenses you can deduct include gym rent, your insurance, your qualifications and CPD courses, and kit you use for work. Note: HMRC usually won't let you claim your own gym membership.

Step 4 — Decide where you'll train

Your options:

• Rent floor space in a gym — the most common self-employed model. You pay a fixed monthly fee and keep all your session income. Budget gyms can be around £200/month; commercial gyms run £450–£750/month, with London at the top.
• Train at clients' homes or outdoors — low overheads, but you travel.
• Online coaching — no rent, train anyone anywhere, but you have to be good at delivering remotely.
• Hours-for-rent deals — some gyms cut your rent if you cover classes.

Many PTs start employed at a gym for steady income, then go self-employed once they've built a book.

Step 5 — Get clients, and get organised

Two things to nail:

• Getting clients. Start with people you know, ask for referrals, post helpful content on one platform, set up a free Google Business Profile, and be the friendly, knowledgeable face on the gym floor. (Full plan: How to Get More Personal Training Clients in 2026.)
• Managing clients. Look professional from session one. Don't run your business from a WhatsApp thread and a notes app. Keep client details, workouts, bookings, progress and invoicing in one place — it makes you look established on day one and saves you hours every week.

CoachDesk is built for exactly this — UK self-employed PTs starting out — at £19/month, with a 14-day free trial and no card. Start free here.

A realistic timeline

• Months 1–3: Qualify, get insured, register with HMRC, sort where you'll train.
• Months 3–6: Land your first 5–10 clients. Look professional from session one.
• Months 6–12: Build referrals, raise your rates, decide between full self-employed or hybrid.

Start before you feel ready. The PTs who make it aren't the most qualified — they're the ones who keep showing up.