Home - Sub3fitness

Welcome to the home of Sub3fitness working in the Croydon and Beckenham areas, working with people to fulfil their exercise goals, transforming your life to getting you fitter.

Sub3fitness owner David McKenzie is a former European, Commonwealth and World Cup 400 metre relay gold medalist who is a qualified level 4 personal trainer. David was able to maximise his potential as a world class athlete and whilst he cannot guarantee that you will become a world class athlete. He will ensure that you can set realistic goals that you are able to achieve. David will pass on his knowledge and experience to you to enable you to become the best version of yourself.

At Sub3fitness you will not be treated as just another number, you are an integral part of the Sub3fitness family and our aim is to get the best out of you by guiding you to improve your fitness level.

So what are you waiting for? At Sub3fitness we are confident at getting you going and encourage you to try before you buy. So we are going to give you your first session FREE before you commit. Our programme is open to all levels of fitness so don’t worry if you haven’t exercised for a long time.

Please do have a look at the Sub3fitness Facebook page and especially the reviews from people who have trained with Sub3fitness and find out what their experience has been like. I’m sure after reading you’ll be inspired to join the Sub3fitness family. Just remember, you have an opportunity to try before you buy. The Sub3fitness team look forward to seeing you.

Hosannah Dawn-Erika

2020-08-04T12:13:05+0000

Before I started training with David, I was essentially exercise averse. I had started walking more due to the... lockdown, but other than that, my main form of exercise was opening the car door! I wanted to make more use of the spare time I had, so contacted him for some direction and an overall change of mindset. I was reserved about embarrassing myself (which I’ve done...often), working outside in the rain (which I had to quickly overcome) and passing out (which I’m still yet to do!) David puts you totally at ease with any concerns you have - or rapidly makes you realise that they’re really excuses that you’ve allowed to control where you are. The real benefit of working with a PT over online videos or going to the gym is that the exercises are demonstrated to you properly and you have someone to point out common errors, such as posture, speed etc. David has a great sense of humour, is patient but firm and wants to get the best out of you - all in the name of you getting the body you deserve he says. My fitness levels have certainly improved during my time with him, but more importantly so has my desire to accomplish and maintain that body I want.read more

Sarah Kent

2020-01-26T18:42:49+0000

Before I started training with David I was always finding an excuse not to excercise, either to tired or I just dont... have time. I was really nervous about starting. I was worried I would do all the excercise wrong and worried about me looking all red and sweaty. The nerves disappeared after my first session with David. He made me feel at ease and explained every move to me clearly. The anxieties I had about how I looked and getting the moves wrong all went away. The laughing helps to. I have been working with David now for a few weeks and I am seeing results. Not just physically but mentally,he has made me realise I can do these moves and can achieve what I want. David pushes me to do my best and because of this I am now gaining strength and toning up my areas that needed sorting.read more

Bruce Agombar

2020-01-08T21:17:54+0000

My exercise regime was non-existent and it was clear that I was not in good shape. I knew David from previous sessions... a few years back and remembered how demanding a session with him can be. My right knee was also a concern when it came to physical activity as it was prone to being painful at times. Nevertheless I resolved to try again. Fast forward a year or so and a regular weekly session has done wonders for me. I am not sure that I could say I look forward to the sessions, but that is down to me wanting to stay in bed later than 5am! David is an excellent motivator and provides constant encouragement and humour, sometimes he is even funny! His knowledge of exercise and how it affects the body is truly amazing and he has been able to create sessions that are not only challenging but varied and tailored to my needs. For instance my knee no longer hurts! Aside from the early starts I can feel my improvement in all areas, my core is stronger, my arms and legs too. By cleverly altering (upping) what we (I) do my strength and stamina has improved greatly. I am amazed how challenging the sessions can now be and how little recovery time I require when compared to when I started. I have now started Park Running, something I would never have considered and certainly would have been unable to do had I not been put through my paces by David. I can highly recommend him as a personal trainer, but maybe not a comedian!read more

Kristi Kacee Carter-Griffiths

2019-07-11T13:39:02+0000

I was in ok physical health but had taken a break from fitness for a few months and was ready to get fit again. I... enjoy working out but it is usually feast or famine for me - usually triggered when my trousers have gotten a bit tighter than usual... :-) I needed someone to motivate me... I met David through my sons' basketball coach and was eager to get started. David took the time to get to know me and my strengths and weaknesses. He is flexible and allows me to tailor each work out so I can achieve my goals. I feel physically challenged and my fitness levels have steadily gotten back to where they should be. We have a real laugh each week; between gasping for breath and guzzling water.read more

Deborah Holman

2019-01-25T17:31:28+0000

Its that time again but this time its London to Amsterdam - its all kicking in again from all that you taught me and I... can hear your voice spurring me on even when I am not with you ! You make me feel like I can do anything if I put my mind to it.read more

Kim Simpson

2019-01-21T22:18:04+0000

I was a little worried I wouldn’t be able to keep up with the pace or do the exercises expected. David made me feel at... ease and explained everything clearly. What the exercises were and what they were for. He was very encouraging at all times. He let me work at my own pace but knew when to push me so I could achieve my goal. We worked hard but had fun too. After working with David I felt good about myself and the achievements I made. It has also encouraged me to continue keeping fit and have the confidence to try new exercises and classes.read more

Jan Noble

2018-11-14T20:50:37+0000

I had not done any exercise for about a year and I was a bit worried that exercise would be too tough as 1-1 or... 1-2. You have been really encouraging & I know you push me more than other trainers have done. Also you don’t let us off….no short cuts! Always nice to get a follow up hello around the workplace. I have realised I can do more than I expected and having a laugh whilst doing so. I can see improvements: improved stamina, & toning but I know I need to fit more into my weekly schedule. It’s perfect being based at work & going straight from the office. Thank you – I would thoroughly recommend you as a PT.read more

Deborah Kenny

2018-10-01T20:13:35+0000

I had lost weight but “fallen off the barrel” of exercising regularly. I wanted to start again in a structured and safe... way. What I enjoyed most was having a personal workout with gradual progression, so that I now look back and see how much I have made. I also liked your good humour and patience. No humiliation or being made to feel inadequate and tailored to my individual needs. I am impressed with my core strength and now able to do a MARVELLOUS side plank!!!.read more

Theresa Staunton

2018-08-11T19:34:36+0000

From non runner to London Marathon 2018, could not have done this without Sub3Fitness.

Are You Ready For The Challenge?