Welcome to
Using Scientific Theory to Achieve your Fitness Goals
The Theory of Fitness Approach
Theory of Fitness is all about educating people on how to live healthier through exercise, nutrition and recovery. We do this while sticking to our mantra 'using science based evidence to further our theory of fitness'.
Using Theory of Fitness you you'll have a professional, experienced and knowledgeable personal trainer who will write your programs, explain the rationale and help you reach your goals.
Check out our basic tools to help with your fitness journey or see our personal training options below.
About Lewis Black
Lewis created Theory of Fitness with the belief that fitness should be accessible to everyone and so has set out to achieve the goal of getting as many people to be as fit and healthy as possible.
To achieve this Lewis completed a BSc in Sport and Exercise Science, L3 Extended Diploma in Sport, L3 Diploma in Personal Training, L2 Fitness Instructor, and L2 Spin Qualification among various other qualifications. Using the theory, we help individuals achieve their fitness goals by creating personalized plans that take into account their unique needs and abilities.
![Train smarter - not just heavier.
2025 research shows Velocity-Based Training (VBT) helps you build more power, manage fatigue, and get results.
That means better intent, better feedback, and better gains.
Velocity Based Training research shows: 5% more accurate than traditional %1RM training Predicts strength & power improvements Keeps you explosive without overtraining
Want to know more about how to be the best you? Contact me through my page and we can get started!
#VelocityBasedTraining #VBT #SportsScience #StrengthCoach #PersonalTrainer #Power Training #AthleticPerformance #SpeedTraining #EvidenceBasedTraining #GymScience #strengthandconditioning #PerformanceCoach #TrackAndField #ExplosiveStrength #ScienceOfTraining #SmartTraining #TrainWithIntent #GymTips #FitnessEducation #CoachTips #Insta #Discovery #instagood #fyp
Achermann, B.B. Regazzi, N. Heynen, R. Ludin, D. Suter, J. Drewek, A. Lorenzetti, S.R. (2025) From Monitoring to Prediction: Velocity-Based Strength Training in Female Floorball Athletes. Sports. [Online] 13 (6) DOI: 10.3390/sports13060175
Han, Y. Xie, Y. Zhang, Z- Garcia-Ramos, A. (2025) The effect of velocíty-based resistance training (VBT) on lower limb strength performance in male collegiate boxers: a randomized controlled trial. Front Physíol. [Online] 16 (1) DOI: 10.3389/fphys.2025.1701045](https://scontent-iad3-2.cdninstagram.com/v/t51.82787-15/576535078_17986440029871826_3248862483877244635_n.webp?stp=dst-jpg_e35_tt6&_nc_cat=106&ccb=7-5&_nc_sid=18de74&efg=eyJlZmdfdGFnIjoiQ0FST1VTRUxfSVRFTS5iZXN0X2ltYWdlX3VybGdlbi5DMyJ9&_nc_ohc=TD7Kwe_Tad0Q7kNvwE0xbKx&_nc_oc=Admd9vQn9DdngIS7bwZlXFfxv5hpRgTGDeE9nWnKsAOkHqnuNexb36aEKsaw0MkAldY&_nc_zt=23&_nc_ht=scontent-iad3-2.cdninstagram.com&edm=ANo9K5cEAAAA&_nc_gid=8YhkcFjw_xglWWyf43WMDQ&oh=00_Afhu54rBUWmLxHYrMcl8WdKdGyubcaYocgXCv1l-v84rnA&oe=692923CA)
![Do you know your facts from fiction?
New 2025 research reveals that many'common sense' gym beliefs are actually myths. In a survey of over 700 gym-goers people only correctly identified 5/14 training statements. Think you know your stuff? Take a look at the reference below to see all the questions!
Unger, A. Mosgan, C. Wolte, C. Pettauer, S. Wilke, J. (2025) Knowledge of gym goers on myths and truths in resistance training. Scientific Reports. [Online] 15 (1). DOI: 10.1038/s41598-025-87485-8
And if you or anyone you know is looking for mythbusting with a Sport and Exercise Scientist, you can contact me through my page for personal training.
#StrengthTraining #GymScience #MythBusting #ResistanceWorkout #FitTips #FitnessEducation #2025Research #Northampton #PersonalTrainer #gym](https://scontent-iad3-2.cdninstagram.com/v/t51.82787-15/563398475_17983490732871826_1346010896671362460_n.webp?stp=dst-jpg_e35_tt6&_nc_cat=103&ccb=7-5&_nc_sid=18de74&efg=eyJlZmdfdGFnIjoiQ0FST1VTRUxfSVRFTS5iZXN0X2ltYWdlX3VybGdlbi5DMyJ9&_nc_ohc=BkTeDglwJ4oQ7kNvwEUgALe&_nc_oc=AdnZHD8Pzhw0IbEpyEvAfgKZgbCX5ZMc4Z55i4OPdXKPuEHlxowMUoQZGoyHHhkIi3k&_nc_zt=23&_nc_ht=scontent-iad3-2.cdninstagram.com&edm=ANo9K5cEAAAA&_nc_gid=8YhkcFjw_xglWWyf43WMDQ&oh=00_AfhqnVx7hFQM5V2SK0Tu4bTRts_ed3PTdWD9k2xS30UGLw&oe=6929135F)
![Have you seen this incredible study by Cullen et al. (2024)?
Cullen, J.M. Shahzad, S. Kanaley, J.A. Ericsson, A.C. Dhillon, J. (2024) The effects of 6 wk of resistance training on the gut microbiome and cardiometabolic health in young adults with overweight and obesity. Journal of Applied Physiology. [Online] 136 (2). DOI: 10.1152/japplphysiol.00350.2023
This study looked into all the effects exercise has on those with obesity or that are overweight and it shows a significant change on health in all aspects! Share this with someone who might find this interesting!
If you or someone you know is interested in Personal Training you can contact me through my page!
#FitnessTips #WellnessJourney #HealthyLifestyle #MensFitness #WomensFitness #PersonalTrainerLife #FitEducation #HealthAndFitness #ResistanceTraining #StrengthTraining #GymLife #FunctionalFitness #TrainSmart #StrongerEveryday #PerformanceTraining #LiftToLive #ExerciseScience #GutHealthScience #FitnessEducation #HealthFacts #EvidenceBasedFitness #SportsScience #FitnessMythBusting](https://scontent-iad3-2.cdninstagram.com/v/t51.82787-15/560453728_17982581579871826_7359335293310808939_n.webp?stp=dst-jpg_e35_tt6&_nc_cat=111&ccb=7-5&_nc_sid=18de74&efg=eyJlZmdfdGFnIjoiQ0FST1VTRUxfSVRFTS5iZXN0X2ltYWdlX3VybGdlbi5DMyJ9&_nc_ohc=rTlt4XFDLYsQ7kNvwGYY81l&_nc_oc=Adnfg8JUAsqly1oemzdqRUdpeuM24DDxoTriIbCxMfaBH_uGTNGPH9kb8qWBqbCuzBY&_nc_zt=23&_nc_ht=scontent-iad3-2.cdninstagram.com&edm=ANo9K5cEAAAA&_nc_gid=8YhkcFjw_xglWWyf43WMDQ&oh=00_Afi9JBrzgORSw-xGpPhXX6CFE-grPrlcXVn4tG15diE4Sg&oe=69292D75)
What's On Offer
Below you can read up on all the services currently on offer. Whether you are just starting out, looking to develop or even break plateaus and work towards a specific goal there is something for everyone!
Where are we located?
Currently operating out of Selected Fitness. Online Programming and Moblie Training is also remotely available.
Training is available Mon-Fri from 6am-Late, If you would like a different day or time please contact using either the form on the Personal Training page or contact details above.