About Me
My Story
I’m Isaak Marshall, the founder of Performance Marshall. I’m a training coach with a lifelong passion for sports performance, health and fitness.
I’ve been involved in competitive sport for over 25 years, a passion nurtured during my childhood in the sport loving nation of South Africa. I attended an all boys High School in England that put an emphasis into sports performance with activity and competition built into daily life. After High school I attended the University of Bangor in Wales where I graduated Bsc. Zoology.
During my time in UK I had the opportunity to compete in a variety of different activities including: Rugby Union, Rugby League, Soccer, Cricket, Basketball, Badminton, Field Hockey and American Football. Around age 15 I began to focus my training efforts towards American football and am honoured to have represented the Great Britain National team, including as a Captain of the GB Jr. team in 2012 and 2013. Since 2017 I’ve been employed as a semi-professional athlete playing American Football in Europe and giving me valuable insight into what it takes to perform at a high level both physically and mentally.
I’ve been coaching others for almost as long as I've been playing sport. I co-ordinated training sessions with my friends and teammates whilst in high school and university, helping my peers to programme their workouts. In 2016/17 I acted as the Strength and Conditioning coach for the Bangor Muddogs (University Sport Team) and more recently I have been the Head Coach for Mikkeli Bouncers Women (2022) and Kuopio Steelers Women (2024-2026) American football teams in Finland. Highlights of which include an undefeated season and Division 1 Championship with Steelers Naiset in 2024 and playoff appearances in 2022 and 2025 in the Naisten Vaahteraliiga (SM League) with Bouncers and Steelers.
I have worked with people of all backgrounds from those simply looking to improve their general health to athletes chasing high levels of performance. In 2025 I decided to turn my passion for coaching into a business, creating Performance Marshall to help people progress towards their health and fitness goals.
I specialise in helping sports participants become more athletic and confident in their performance but my work goes beyond sport. More than anything I love to contribute to the personal growth and progression of those around me no matter what goals or starting points they have. There’s nothing more rewarding than seeing someone commit to their goals, put in the work, and witness their progress - whether that’s on the field, in the gym or simply in everyday life.
So if you're interested in an energetic coach excited to share in your fitness journey and help you reach your full potential then contact me and lets get started!
Performance Marshall - Passionate about your performance.
Client Testimonials
Niko - 47
Isaak is a professional coach who is easy to work with. He genuinely listens to your needs and designs a training program that will help you get into shape effectively. Coach Isaak knows how to bring out your full potential, which is why I highly recommend him.
Personally, working with Isaak helped me rediscover my motivation for gym training, and he created a program tailored specifically for me, taking my back pain into account.
Isaak on ammattitaitoinen valmentaja, jonka kanssa tulee helposti toimeen. Hän kuuntelee aidosti tarpeitasi ja suunnittelee sinulle ohjelman, jonka avulla pääset varmasti kuntoon. Valmentaja Isaak saa sinusta irti juuri sen, mitä tarvitsee, ja siksi suosittelen häntä lämpimästi.
Itse sain Isaakin avulla uudelleen innostuksen kuntosaliharjoitteluun sekä minulle sopivan ohjelman, jossa selkäkipuni on huomioitu.
Toni - 24
Since starting with Isaak training has become a lot easier and making progress has become far easier as well. He is super easy to work with, he listens and always wants to get feedback to provide me a good service. He pushes me just the right amount to get sh*t done.
Isaakin kanssa aloittamisen jälkeen harjoittelusta on tullut paljon helpompaa ja edistyminenkin on helpottunut huomattavasti. Hänen kanssaan on superhelppo työskennellä, hän kuuntelee ja haluaa aina saada palautetta voidakseen tarjota minulle hyvää palvelua. Hän puskee minua juuri sopivasti, jotta saan hommat tehtyä.