Signs of a Bad Personal Trainer and When to Switch

Spotting the signs of a bad personal trainer early can save you months of wasted sessions, money and sometimes an injury. The problem is that a bad trainer can still be friendly, fit and fun to be around. Being likeable is not the same as being good at the job.

This guide is for people who already have a trainer, or have just started with one, and have a nagging feeling something is off. It covers the red flags in and around sessions, what good coaching looks like instead, how to raise a concern and when it is time to switch.

Signs of a bad personal trainer during sessions

They are on their phone

The odd glance at a clock is fine. Scrolling, texting or taking calls while you train is not. You are paying for attention. If your trainer is not watching your reps, they cannot correct your technique or decide when to add weight.

Every session is random

Variety is not a plan. If you never repeat exercises, never see the same weights twice and cannot tell whether you are stronger than last month, there is no programme. Real progress comes from doing the right things repeatedly and adding a little more over time. My guide to progressive overload explains why that matters.

They judge sessions by how wrecked you feel

Being sweaty and sore is easy to achieve and says very little about whether the session was useful. Good training leaves you challenged but able to recover for the next one. Being sick, dizzy or hobbling for days is not a badge of honour.

They ignore pain

"No pain, no gain" has no place when you tell a trainer something hurts. Sharp pain, joint pain or pain that gets worse during a set means stop and change the exercise. A trainer who tells you to push through is putting you at risk.

Poor technique coaching

If your form on squats, deadlifts or presses has not improved after several weeks, or they never explain why you are doing an exercise a certain way, that is a coaching gap.

Red flags outside your sessions

• No assessment at the start. They never asked about injuries, medical history, sleep or stress.
• No tracking. Nothing is written down: no weights, no measurements, no check-ins.
• Extreme diets. Very low calories, cutting out whole food groups or "detox" plans without good reason.
• Selling supplements hard. Especially if they profit from them or say you cannot get results without them.
• Medical advice outside their lane. Diagnosing injuries or telling you to ignore your GP.
• Constant cancellations or lateness. Your time matters as much as theirs.
• Unclear billing. Surprise charges, vague contracts or pressure to renew early.
• Body shaming or comparing you to others. Motivation should never come from making you feel small.

What a good personal trainer does instead

It helps to know what you should be getting. A good trainer:

1. Starts with a proper conversation about your goals, health and lifestyle
2. Follows a written plan that progresses over weeks, not just sessions
3. Records what you lift and how you feel, and reviews it regularly
4. Coaches technique with clear, simple cues
5. Adjusts sessions around pain, fatigue and busy weeks
6. Gives realistic, practical food advice and refers out when needed
7. Measures progress in several ways, as covered in how to measure fitness progress
8. Communicates clearly about prices, scheduling and expectations

If you have an injury or ongoing pain, look for someone who plans around it carefully. That is the whole idea behind injury-safe personal training, where safe exercise choices come before intensity.

Is it them or is it the timeline?

Before you blame your trainer, be fair about the time frame and your side of things. Results take weeks and months, not days. In the first month, the main wins are usually better technique, more energy and a routine you can stick to. My article on your first month with a personal trainer sets out what is realistic.

Ask yourself honestly:

• Have I been turning up consistently?
• Have I followed the food advice most of the time?
• Have I told my trainer about stress, poor sleep or changes at work?

If the answer is yes to all three and you still see no progress after 8-12 weeks, and your trainer has not changed anything, the problem is likely the coaching.

How to raise a concern

Sometimes a direct conversation fixes things. Try something like: "I want to make sure we are on track. Can we look at what I have achieved so far and what the plan is for the next 4 weeks?" A good trainer will welcome this and show you the numbers. A poor one will get defensive or vague.

Be specific about what bothers you, whether it is phone use, lack of structure or pain during sessions. Give them one chance to fix it, unless it is a safety issue.

Want help with this? If your current training is not working, I am happy to have an honest conversation about why. At SYP Fitness I coach 1-to-1 in a private studio, and my 12-Week Body Transformation includes training, a nutrition plan, weekly check-ins and InBody scans every 4 weeks so progress is measured, not guessed. Book a free consultation and we will look at where you are and what to change.

When to switch personal trainers

It is time to move on if:

• You have been injured or hurt because of something they told you to do
• They ignored a concern you raised clearly
• You have trained consistently for 3 months with no measurable progress and no changes to the plan
• You dread sessions because of how they speak to you
• Billing or scheduling problems keep happening

Switching is normal. Check your contract for notice periods, ask for a copy of your programme and records, and leave politely. When you look for someone new, use what you learned. My guide on how to choose a personal trainer walks through the checks to make before you commit. If you are local, you can find out how I work as a personal trainer in Archway and North London.

Frequently asked questions

What are the signs of a bad personal trainer?

Common signs include using their phone during sessions, random workouts with no plan, ignoring pain, no assessment at the start and no tracking of progress. Pushing extreme diets or supplements, giving medical advice and making you feel bad about your body are also red flags. One small slip is human, but a pattern is a problem.

How long should I give a personal trainer before switching?

If you are consistent, give it about 8-12 weeks to see measurable progress in strength, measurements or how you feel. Safety issues are different. If a trainer ignores pain or causes an injury, you do not need to wait. Raise any other concerns directly first, as many problems can be fixed with an honest conversation.

Is it normal to feel sore after every personal training session?

Some soreness is normal when you start or change your programme, and it usually eases within a few days. Feeling wrecked after every session for weeks is not a sign of good training. A good trainer balances effort with recovery so you can train regularly. Pain in joints or sharp pain is a reason to stop and get advice.

Can I ask my personal trainer to change my programme?

Yes. A programme should fit your goals, schedule and body, so feedback helps your trainer get it right. Explain what is not working, whether that is an exercise that hurts, sessions that run too long or goals that have changed. A good trainer will explain their reasoning and adjust where it makes sense.

Start your transformation

SYP Fitness is a private 1-to-1 personal training studio at 2-4 Navigator Square, Archway, London N19 3UB, 2 minutes from Archway tube. Rated 5.0 from 100+ Google reviews.

Apply for a free consultation · WhatsApp Artem · Call 07301 512215 · See prices